Detailed Description
The invention is further illustrated by the following examples and figures, without thereby restricting the invention to the scope of the examples. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
In the following examples, the reagents and materials used are all conventionally commercially available, unless otherwise specified.
The feed for feeding the coccinella septempunctata comprises the following components in parts by mass: 500-1000 parts of aphid treatment substance, 1-4 parts of beta carotene, 0.000001-0.00001 part of juvenile hormone, 50-300 parts of cane sugar and 1-5 parts of potassium sorbate; preferably, the composition comprises the following components in parts by mass: 700-800 parts of aphid treatment substance, 1.5-2.5 parts of beta carotene, 0.000003-0.000006 part of juvenile hormone, 100-200 parts of cane sugar and 1.5-2.5 parts of potassium sorbate.
The aphid treatment substance is obtained by grinding adult aphids into pulp and mixing the pulp with purified water according to the proportion of 1:3, wherein the adult aphids are obtained by inoculating aphids with reproductive capacity to host plants and collecting the aphids when the aphid coverage rate of the host plants exceeds 70%. Adult aphids are large in size and weak in climbing force, and are easy to shake off, grown adult aphids are shaken off into a gauze container, and the gauze is placed in a grinding bowl for grinding, so that the adult aphids are ground into powder.
The preparation method of the composition comprises the following steps:
(1) mixing the aphid treated substance with sucrose, potassium sorbate and purified water to obtain a first solution;
(2) mixing beta carotene with purified water to obtain a second solution;
(3) and mixing the first solution, the second solution and juvenile hormone, and adding a proper amount of purified water to a constant volume to obtain the composition, wherein the juvenile hormone is a low-concentration and high-efficiency hormone substance, is insoluble in water, and is added after being dissolved into a solution with a higher concentration by using an organic solvent (75% alcohol), and the used solvent does not influence the breeding of the coccinella septempunctata due to extremely low total content of the juvenile hormone. The mixture is initially prepared into paste, and the obtained mixture is filled into a semiellipsoid container with diameter of 0.5-2.0cm and height of 0.2-0.5cm, sealed with a sealing film, and stored at 5-10 deg.C for 5-10 days, after storage, the mixture becomes solid, which is beneficial for replacement of feed, and the mixture will gradually melt after feeding for eating by coccinella septempunctata.
When the coccinella septempunctata is fed, the used container can be a culture dish, a plastic box or a beverage cup, the volume of the container is 10-2000ml, and a gauze or a material with the gauze can be used for replacing a cover or a box body, so that the air in the container can be normally exchanged, the adult coccinella septempunctata in the container is prevented from being killed by oxygen deficiency, and the culture dish with the diameter of 9cm and the height of 2cm is mainly used in the experiment.
A new artificial feed (0.2g) is added for each feeding, and the residual artificial feed before treatment is used for preventing deterioration from influencing the normal growth and breeding of the coccinella septempunctata, a small amount of fresh aphids (50-100 aphids are fed for each feeding) are added every 5-10 days, the nutrient elements lacking in the milled aphids are supplemented, and the health of the coccinella septempunctata is ensured.
Example 1
To determine the optimum concentration of beta-carotene, the following experiments were designed:
a basic formula (750 g of aphid processed substances, 150g of cane sugar, 100ml of purified water and 2g of potassium sorbate) is used as a main body, and 5 processing groups are designed, wherein A, B, C, D and E are used as a main body, 0.5g of beta carotene is added to the A basic formula, 1.0g of beta carotene is added to the B basic formula, 1.5g of beta carotene is added to the C basic formula, 2.0g of beta carotene is added to the D basic formula, and 2.5g of beta carotene is added to the E basic formula. Control tests were carried out with both pure feed and pure aphid feeding. The test time is 30 days, the feeding condition, the egg laying amount and the hatching condition of the coccinella septempunctata in each group are observed, and the optimal beta carotene concentration is screened out.
The indoor environment is set to be at the temperature of 25 +/-1 ℃, the humidity of 75 percent and the illumination time of 16 h/d. The culture dish is used as a feeding container, and filter paper is filled at the bottom of the culture dish, so that the phenomenon that the humidity in the dish is too high is prevented, and the collection of eggs is facilitated. The coccinella septempunctata is fed according to 5-day feed and 1-day aphid (no feed is added when the aphids are fed), the feed is replaced once a day, and the specific treatment is as follows:
and (3) treatment A: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 0.5g of beta carotene, wherein the coccinella septempunctata is fed according to the sequence of 5-day feed and 1-day aphid, and the feed is fed every day by 0.2 g;
and (B) treatment: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 1.0g of beta carotene, wherein the coccinella septempunctata is fed according to the sequence of 5-day feed and 1-day aphid, and the feed is fed every day by 0.2 g;
and C, treatment: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 1.5g of beta carotene, wherein the coccinella septempunctata is fed according to the sequence of 5-day feed and 1-day aphid, and the feed is fed by 0.2g every day;
and D, processing: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 2.0g of beta carotene, wherein the coccinella septempunctata is fed according to the sequence of 5-day feed and 1-day aphid, and the feed is fed every day by 0.2 g;
and E, processing: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 2.5g of beta carotene, wherein the coccinella septempunctata is fed according to the sequence of 5-day feed and 1-day aphid, and the feed is fed every day by 0.2 g;
pure feed control group: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 1.5g of beta carotene, wherein the aphid treatment substance is fed with 0.2g of feed every day, and fresh aphids are not fed;
pure aphid control group: the aphids are fed for 200 and 300 times every day without feeding.
The results of the effect of using different amounts of beta carotene on the feeding frequency of coccinella septempunctata are shown in fig. 1, and it can be seen from the results in fig. 1 that the average feeding frequency of coccinella septempunctata fed by 5 treatment groups and pure feed groups in the whole observation period is from high to low: d is more than B, more than A, more than E, more than pure feed and more than C, and the feed is sequentially 0.383, 0.325, 0.316, 0.249, 0.192 and 0.166 times/min.
The results of using different amounts of beta carotene on the egg laying amount of coccinella septempunctata are shown in figure 2, and the results in figure 2 show that the egg laying amount of coccinella septempunctata fed by 5 treatment groups, CK group and pure feed group in the whole observation period is from high to low: CK > D > E > C > B > A > pure feed, 51.2, 46.3, 41.6, 39.0, 23.3, 22.2, 5.2 grains in sequence. The egg laying amount of the coccinella septempunctata in the groups A and B is extremely lower than that of the coccinella septempunctata in the group CK (P is less than 0.01), and the egg laying amount of the coccinella septempunctata in the groups C, D and E has no significant difference (P is more than 0.05) with that of the coccinella septempunctata in the group CK.
The results of the effect of using different amounts of beta carotene on the hatching rate of coccinella septempunctata eggs are shown in fig. 3, and it can be seen from the results in fig. 2 that the average hatching rate of coccinella septempunctata fed by 5 treatment groups, CK group and pure feed group in the whole recording period is from high to low: e is more than B, more than D, more than A, more than CK and more than C, and is 86.0%, 82.1%, 79.6%, 77.1%, 76.5%, 75.3% and 2.2% in sequence. There was no significant difference in egg hatchability between artificial feed A, B, C, D, E (P > 0.05).
Example 2
To determine the optimal concentration of juvenile hormone, the following experiments were designed:
research has shown that: the low-concentration juvenile hormone has the characteristic of promoting the development of insect ovaries, but the high-concentration juvenile hormone can inhibit the normal growth and development of insects, and if the addition concentration of the juvenile hormone which has favorable influence on the coccinella septempunctata is determined, the egg laying efficiency of the coccinella septempunctata can be improved.
The test takes a basic formula (aphid processed substance 750g, sucrose 150g, purified water 100ml and potassium sorbate 2g) as a main body, 5 treatment groups are designed, A, B, C, D, E, wherein A is taken as a basic formula and is added with juvenile hormone 1 mu L, B is taken as a basic formula and is added with juvenile hormone 5 mu L, C, is taken as a basic formula and is added with juvenile hormone 10 mu L, D, is added with juvenile hormone 20 mu L, E, is added with juvenile hormone 50 mu L, and a control test of feeding pure feed and pure aphid is carried out at the same time. The test time is 30 days, the feeding condition, the egg laying amount and the hatching condition of the coccinella septempunctata in each group are observed, and the optimal juvenile hormone concentration is screened out.
The indoor environment is set to be at the temperature of 25 +/-1 ℃, the humidity of 75 percent and the illumination time of 16 h/d. The culture dish is used as a feeding container, and filter paper is filled at the bottom of the culture dish, so that the phenomenon that the humidity in the dish is too high is prevented, and the collection of eggs is facilitated. Feeding coccinella septempunctata according to 5-day feed and 1-day aphid sequence (no feed is added when feeding aphids), and changing the feed once a day, wherein the specific treatment is as follows:
and (3) treatment A: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 1 microliter of juvenile hormone, feeding coccinella septempunctata in the order of 5 days of feed and 1 day of aphid, and feeding 0.2g of feed every day;
and (B) treatment: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 5 mu L of juvenile hormone, feeding coccinella septempunctata in the order of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
and C, treatment: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 10 mu L of juvenile hormone, feeding coccinella septempunctata in the order of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
and D, processing: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 20 mu L of juvenile hormone, feeding coccinella septempunctata in the order of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
and E, processing: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 50 mu L of juvenile hormone, feeding coccinella septempunctata in the order of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
pure feed control group: 750g of aphid treatment substance, 150g of cane sugar, 100ml of purified water, 2g of potassium sorbate and 10 mu L of juvenile hormone, wherein the aphid treatment substance is fed with 0.2g of feed every day without feeding fresh aphids;
pure aphid control group: the aphids are fed for 200 and 300 times every day without feeding.
The results of the effect of using different juvenile hormone contents on the feeding frequency of the coccinella septempunctata are shown in fig. 4, and the results in fig. 4 show that the average feeding frequency of the coccinella septempata fed by 5 treatment groups and a pure feed group in the whole observation period is from high to low: b is more than A, more than C, more than D is more than pure feed, and more than E, namely 0.293, 0.276, 0.232, 0.211, 0.177, 0.175 times/min in sequence.
The results of the effect of using different juvenile hormone contents on the egg laying amount of coccinella septempunctata are shown in FIG. 5, and it can be seen from the results in FIG. 5 that the egg laying amount of coccinella septempunctata fed by 5 treatment groups, CK group and pure feed group in the whole observation period is from high to low: CK > B > A > C > E > D > pure feed, 43.9, 36.6, 34.8, 31.5, 28.0, 26.9 and 2.5 grains in sequence. C. The egg laying amount of the coccinella septempunctata in the groups D and E is obviously lower than that of the coccinella septempunctata in the group CK (P is more than 0.01 and less than 0.05), and the egg laying amount of the coccinella septempunctata in the groups A and B has no obvious difference (P is more than 0.05) with that of the coccinella septempunctata in the group CK.
The results of the effect of using different juvenile hormone contents on the hatching rate of coccinella septempunctata eggs are shown in fig. 6, and it can be seen from the results in fig. 6 that the average hatching rate of coccinella septempunctata fed by 5 treatment groups, a CK group and a pure feed group in the whole recording period is from high to low: CK > B > A > C > D > E > pure feed, 71.0%, 58.1%, 56.4%, 49.3%, 23.0%, 16.9%, 6.4% in sequence. The egg laying rate of the coccinella septempunctata in the groups D and E is extremely lower than the hatching rate of the coccinella septempunctata in the group CK (P is less than 0.01), and the egg laying rate of the coccinella septempunctata in the groups A, B and C is significantly lower than the hatching rate of the coccinella septempunctata in the group CK (P is more than 0.01 and less than 0.05).
In conclusion, in the experiment, C, D, E groups of the beta carotene group artificial feed have good effect, the preferable content of the beta carotene is 1.5-2.5g/L, the best is D group, and the best content is 2 g/L. The artificial feed A, B, C group for juvenile hormone has good effect, and the preferable content of juvenile hormone is 1-10 μ L/L, preferably B group, and the preferable content is 5 μ L/L.
Example 3
In order to clarify the feeding effect of the overall formula, the following experiments were designed:
under the premise of determining that the reasonable content of the beta carotene is 1.5-2.5g/L and the content of the juvenile hormone is 5 muL/L (because the content of the juvenile hormone is too low, the optimal content of 5 muL/L in the second test is taken), a treatment group is designed: groups C1, C2, C3, C4, C5, D1, D2, D3, D4, D5, E1, E2, E3, E4, and E5; C. the D and E groups respectively correspond to 1.5g/L, 2.0g/L and 2.5g/L of carotene added in the experiment I, and 1-5 groups respectively add aphid sucrose mixtures with the mass ratio of 1:2, 1:1, 2:1, 4:1 and 8:1 of aphid treatment substances and sucrose. The indoor environment is set to be at the temperature of 25 +/-1 ℃, the humidity of 75 percent and the illumination time of 16 h/d. The culture dish is used as a feeding container, and filter paper is filled at the bottom of the culture dish, so that the phenomenon that the humidity in the dish is too high is prevented, and the collection of eggs is facilitated. The coccinella septempunctata is fed with the feed for 5 days and the aphids for 1 day (no feed is added when the aphids are fed), and the feed is replaced once a day. The test time is 30 days, and the groups with higher feeding frequency and no significant difference between the egg laying amount and the hatching rate and the aphid control group are screened out to determine the proportion of the final formula.
The specific treatment is as follows:
treatment C1: 300g of aphid treatment substance, 600g of cane sugar, 100ml of purified water, 1.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata in the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment C2: 450g of aphid treatment substance, 450g of cane sugar, 100ml of purified water, 1.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata according to the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment C3: 600g of aphid treatment substance, 300g of cane sugar, 100ml of purified water, 1.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata in the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment C4: 720g of aphid processed substances, 180g of cane sugar, 100ml of purified water, 1.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata according to the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment C5: 800g of aphid treatment substance, 100g of cane sugar, 100ml of purified water, 1.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata in the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment D1: 300g of aphid treatment substance, 600g of cane sugar, 100ml of purified water, 2.0g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata in the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment D2: 450g of aphid treatment substance, 450g of cane sugar, 100ml of purified water, 2.0g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata according to the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment D3: 600g of aphid treatment substance, 300g of cane sugar, 100ml of purified water, 2.0g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata in the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment D4: 720g of aphid processed substances, 180g of cane sugar, 100ml of purified water, 2.0g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata according to the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment D5: 800g of aphid treatment substance, 100g of cane sugar, 100ml of purified water, 2.0gg/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata according to the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment E1: 300g of aphid treatment substance, 600g of cane sugar, 100ml of purified water, 2.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata in the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment E2: 450g of aphid treatment substance, 450g of cane sugar, 100ml of purified water, 2.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata according to the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment E3: 600g of aphid treatment substance, 300g of cane sugar, 100ml of purified water, 2.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata in the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment E4: 720g of aphid processed substances, 180g of cane sugar, 100ml of purified water, 2.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata according to the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
treatment E5: 800g of aphid treatment substance, 100g of cane sugar, 100ml of purified water, 2.5g/L of beta carotene and 5 mu L/L of juvenile hormone, feeding coccinella septempunctata in the sequence of 5-day feed and 1-day aphid, and feeding 0.2g of feed every day;
pure aphid control group: the aphids are fed for 200 and 300 times every day without feeding.
The results of the effect of using different levels of aphid treatments on the hatchability of coccinella septempunctata eggs are shown in fig. 7, and it can be seen from the results in fig. 7 that the feeding frequency of coccinella septempunctata fed by 15 treatment groups and CK groups is higher in the whole recording period: c4, C5, D4, D5, E3, E4 and E5, and the ratio of aphid to cane sugar is reasonable from 4:1 to 8: 1.
The results of the effect of using different aphid treatments on the hatching rate of coccinella septempunctata eggs are shown in fig. 8, and as can be seen from the results in fig. 8, the egg laying amount of coccinella septempunctata fed by 15 treatment groups and CK groups in the whole recording period is higher: c5, D4, D5 and E5, and has no significant difference with the control group, and the egg laying amount of the rest treatment groups is significantly lower than that of the control group. It can be seen that the ratio of aphids to sucrose is more reasonable to be 8: 1.
The results of the effect of using different aphid treatments on the hatchability of the coccinella septempunctata eggs are shown in fig. 9, and the results of fig. 9 show that the hatchability difference of the coccinella septempunctata fed by 15 treatment groups and CK groups is not large in the whole recording period, and is basically maintained at a level of 65-80%, and the hatchability difference is not significant compared with that of a control group.
The ratio of the aphid treatment group to the sucrose in the feed formula is optimally 8:1, but in consideration of cost and raw material processing difficulty, the ratio of 4:1 can also be applied to production, and the feeding effect and the cost are both lower, so the ratio of the aphid to the sucrose is set to be 4:1 to 8: 1.
Therefore, the preferable feed formula of the application is as follows: 700-800 g of aphids, 100-200 g of cane sugar, 100mL of purified water, 2g of potassium sorbate, 2 (+ -0.5) g of beta carotene and 5 mu L of juvenile hormone. After the coccinella septempunctata is fed by using the formula, the feeding frequency is high, the aphid demand of about 20 percent is reduced under the condition that the egg laying amount and the hatching rate are not obviously reduced (according to the feed production standard, 0.0375g of aphids are contained in 0.2g of feed, the aphid quantity is about 175 times per day, the aphid demand is lower than that of 200 times per day required by conventional feeding, the space is saved by more than 50 percent (the feed volume is small, and a container with a smaller volume can be used compared with the existing method for feeding the coccinella septempunctata with plants), the artificial reduction is more than 30 percent (the feed can be directly fed after the feed production is completed, fresh coccinella septempunctata plants are not required to be cut every time, the feeding amount is small, and the cleaning is convenient and quick compared with the coccinella septempunctata breeding by using the coccinella septempunctata, and the breeding efficiency of adult coccinella septempunctata is greatly improved.
The detailed description is given to the composition for feeding the coccinella septempunctata, the preparation method thereof and the feed. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.