Papers by Prof. Dr. Mahbuba Jahan
Systematic and Applied Acarology
Tetranychus macfarlanei is a potential threat to various economically important crops. Chemical c... more Tetranychus macfarlanei is a potential threat to various economically important crops. Chemical control is widely used to control this spider mite, but the exclusive reliance on chemical acaricides is now being questioned, and entomopathogens are emerging as a promising alternative. The efficacy of the entomopathogens largely depends on abiotic factors like temperature, humidity, rainfall etc. The experiments were conducted to determine the effect of relative humidity on the efficacy of the entomopathogen Beauveria bassiana (strain GHA), marketed as BotaniGard ES, against the adult female and egg stages of T. macfarlanei under laboratory conditions. Adult females and eggs of T. macfarlanei were treated with three concentrations of BotaniGard (1×106, 1×107, and 1×108 conidia/ml), and virulence was assessed on mites held at three relative humidity levels (55, 75, and 95 ± 2% RH) at 25 ± 1 °C. The results showed that the mortalities of adult females and eggs of T. macfarlanei were dose...
Bookmarks Related papers MentionsView impact
Israel Journal of Entomology, Sep 24, 2020
The yellow jute mite<em> Polyphagotarsonemus latus</em> is one of the major pests of ... more The yellow jute mite<em> Polyphagotarsonemus latus</em> is one of the major pests of jute in Bangladesh. The objectives of this research focussed on establishing the incidence of the yellow jute mite depending on the sowing date, plant age, growing season, hours of the day, environmental variables (temperature, relative humidity (RH) and rainfall), and plant morphology. Three major peaks of the mite population density were recorded: 80.75 mites/cm<sup>2</sup> on 9 June, 74.25 mite/cm<sup>2</sup> on 2 June, and 63.75 mites/cm<sup>2</sup> on 26 May 2011. The prevailing dry conditions (ca. 80 % RH) with moderately high temperatures and without rainfall were found to be favourable for the population build-up; rainfall had a strong negative direct effect on the yellow mite population density. The highest mite population density was observed at noon (64.42 mites/cm<sup>2</sup>), with significantly lower counts during morning (48....
Bookmarks Related papers MentionsView impact
Journal of Bangladesh College of Physicians and Surgeons, 2012
Dentatorubral pallidoluysian atrophy (DRPLA) is a rare type of an autosomal dominant progressive... more Dentatorubral pallidoluysian atrophy (DRPLA) is a rare type of an autosomal dominant progressive late onset cerebellar ataxia. It is caused by a defect in a gene [CAG repeat in atrophin-1 (ATN1) on chromosome 12] and results in damage to the cerebellum, and to its connections within the central nervous system. It is also known as Haw River Syndrome and Naito-Oyanagi disease. This disorder seems to be very rare except in Japan. Patients with DRPLA can exhibit a variety of psychiatric symptoms in addition to extrapyramidal and cerebellar symptoms. We report a case who was 28 years old unmarried man presented at BSMMU, Dhaka in 2010. The present work highlights the variable mode of presentation of DRPLA and the difficulty of an early diagnosis without facility of genetic analysis. The aim of our report was to describe typical clinical presentations of the disease without positive family history. Our patient presented with unsteadiness during walking, irrelevant behavio...
Bookmarks Related papers MentionsView impact
Mymensingh medical journal : MMJ, 2013
This is a cross sectional study where 125 demented patients were enrolled who attended in neurolo... more This is a cross sectional study where 125 demented patients were enrolled who attended in neurology department of Bangabandhu Sheikh Mujib Medical University (BSMMU) Hospital. The purpose of the study was to find out the etiology of dementia. Dementia was diagnosed by the criteria indicated by Diagnostic and Statistical Manual of Mental Disorders (DSM)-IV and confirmed by Mini Mental State Examination (MMSE) score. Diagnosis of specific type of dementia was made on the basis of established criteria. The most common etiological factor was post stroke dementia (PSDE) (36%) followed by Alzheimer's disease (AD) (14.4%), multi infarct dementia (MID) (8%), Mixed AD and PSDE (6.4%), vitamin B₁₂ deficiency (4.8%) etc. Vascular dementia is the most common etiological factor. Next to this is the Alzheimer disease. This study will provide baseline information regarding the types of dementia occurring in Bangladeshi population and will be the basis of planning health program and data for fu...
Bookmarks Related papers MentionsView impact
Systematic and Applied Acarology, 2017
The effects of three economically important host plants, jute (Corchorus capsularis L.), bean (La... more The effects of three economically important host plants, jute (Corchorus capsularis L.), bean (Lablab purpureus L.) and papaya (Carica papaya L.), on the development, reproduction and demographic parameters of the spider mite Tetranychus truncatus Ehara (Acari: Tetranychidae) were investigated under laboratory conditions of 30 ± 1°C, 60–80% RH and a photoperiod of 16L: 8D using age-stage, two-sex life table analysis. Both male and female T. truncatus successfully completed development from egg to adult on the three host plants. The development time from egg to adult for female T. truncatus was longer on Jute than on bean and papaya. Male and female longevities were higher on jute and bean than on papaya. Fecundity of T. truncatus was higher on jute than on bean and papaya. Adult pre-oviposition period was lower on bean and the number of oviposition days were higher on jute. The net reproduction rate of T. truncatus was significantly higher on jute than on bean and papaya, whereas in...
Bookmarks Related papers MentionsView impact
Brinjal shoot and fruit borer (BSFB) (Leucinodes orbonalis Guen.) is the most destructive and eco... more Brinjal shoot and fruit borer (BSFB) (Leucinodes orbonalis Guen.) is the most destructive and economically harmful insect pests of brinjal. In Bangladesh, brinjal growers are solely rely on various groups of neurotoxic insecticides to control BSFB effectively. Brinjal being a vegetable crop, multiple uses of these insecticides against BSFB will leave considerable toxic residues on fruits which ultimately affect human health. To combat this issue biorational molecules or biopesticides might be the potential alternatives of these toxic insecticides to manage the BSFB infestation. Spinosad (microbial insecticide) and sex pheromone traps are most promising bio-control agents effective against large numbers of lepidopterans. Therefore, in the present study, bioefficacy of spinosad and pheromone trap (Jhilik) alone or their combined effects were evaluated against BSFB infestation. Field experiments were carried out in Entomology Field Laboratory, Bangladesh Agricultural University (BAU), ...
Bookmarks Related papers MentionsView impact
Tetranychus macfarlanei Baker & Pritchard, a serious phytophagous pest of many crops with economi... more Tetranychus macfarlanei Baker & Pritchard, a serious phytophagous pest of many crops with economic importance. In this study, the effects of six reduced risk pesticides viz. abamectin, bifenthrin, bifenazate, etoxazole, hexythiazox, and spinosad with various mode of action, entomopathogenic fungus Beauveria bassiana and botanical neem oil were evaluated against adult and egg stages of T. macfarlanei under laboratory conditions. The mortality of adult female and eggs of T. macfarlanei in all chemicals are dose dependent. The response of adult female against different pesticides between observed and expected values were closely fitted. The LC50 values of all chemicals except spinosad were effective against eggs and all chemicals except etoxazole were effective against adult females of the T. macfarlanei. Etoxazole, known for inhibiting hatching and moulting might be recommended against egg stage as they found suitable but were not much effective against adult mites (LC50 = 340.83 and ...
Bookmarks Related papers MentionsView impact
Indian Journal Of Entomology
Bookmarks Related papers MentionsView impact
Malaysian Journal of Sustainable Agriculture
Bookmarks Related papers MentionsView impact
Acta Scientifica Malaysia
The rice bug, Leptocorisa acuta is one of the major and destructive pests of rice. The experiment... more The rice bug, Leptocorisa acuta is one of the major and destructive pests of rice. The experiments were conducted to study on the extent of damage of rice bug, Leptocorisa acuta and to determine the efficacy of five insecticides. The experiments were laid out in a Randomized Complete Block Design (RCBD) with three replications of each treatment. From the study it was found that the infestation rate was in linear progress and the hill infestation was 5.42 to 13.75%, panicle infestation was 27.27 to 54.55%, grain infestation was 4.70 to 7.58% and partial grain infestation was 1.82 to 2.58% respectively. After using different treatments, it was found that the maximum percent of infestation was observed in control and minimum was in Malathion 57 EC treated plot. The maximum no. of grain per panicle was observed in case of Malathion 57 EC (206.4), whereas the minimum was observed in Control (172.6) plot. Malathion and Neem oil showed similar effect when yield was compared while the minim...
Bookmarks Related papers MentionsView impact
Acta Scientifica Malaysia
The jute yellow mite Polyphagotarsonemus latus constitutes one of the major pests of jute crop in... more The jute yellow mite Polyphagotarsonemus latus constitutes one of the major pests of jute crop in Bangladesh. The objective of this work was to study the biology of the P.latus, to determine its temperature-humidity responces in jute (Corchorus olitorius L.) var. O-9897. Bionomics of jute yellow mite, Polyphagotarsonemus laenerationtus (Banks) were studied in the laboratory of Bangladesh Jute Research Institute during March 2013 to September 2013. The incubation period of yellow mite on the variety O-9897 was 1.95 days for female and 1.90 days for male; larval period of 1.00 days for female, 0.75 days for male ; pupal period of 0.70 days for female and 0.71 days for male ; egg-adult period of 3.65 days for female and 3.44 days for male were highest in the 1st generation with 25.55±0.15oC and 56±1.47% relative humidity among three generations. pre-oviposition and oviposition period was o.65 days and 12.25 days. The highest longevity 13.45 days for female and 8.50 days for male. The d...
Bookmarks Related papers MentionsView impact
Journal of Bangladesh Agricultural University
Bookmarks Related papers MentionsView impact
Advances in Plants & Agriculture Research, Mar 9, 2018
Bookmarks Related papers MentionsView impact
Agricultural Science
The jute yellow mite Polyphagotarsonemus latus constitutes one of the major pests of jute crop in... more The jute yellow mite Polyphagotarsonemus latus constitutes one of the major pests of jute crop in Bangladesh. The objective of this work was to investigation on the natural enemies of jute yellow mite. The investigation on the natural enemies of jute yellow mite were studied in the laboratory of Bangladesh Jute Research Institute during March 2011 to September 2013. As many as six predators of jute yellow mite viz, Predatory mite, Thrips, Minute pirate bug, Lady bird beetle, Mirid bug and Spider were collected and identified. The predation rate of the predatory mite Amblyseius sp. showed an average of 8.8 jute yellow mite per hour in laboratory condition. Predatory mite reached the peak on the 20th June. The highest population was 25 predatory mite/25 leaves. The population of predatory mite declined sharply in the 1st week of July. The nymph and adult of Scolothrips consumed an average of 15.4 and 20.10 yellow mite per hour. Scolothrips sp reached its peak population on 30th June a...
Bookmarks Related papers MentionsView impact
Indian Journal of Entomology
Bookmarks Related papers MentionsView impact
Asian Journal of Medical and Biological Research
Mango hopper is considered as one of the most destructive pests of mango in Bangladesh which can ... more Mango hopper is considered as one of the most destructive pests of mango in Bangladesh which can be effectively controlled by using bio-agents and botanical pesticides. An experiment was conducted at the IPM Laboratory of the Department of Entomology, Bangladesh Agricultural University, Mymensingh, Bangladesh to study the comparative performance of three botanicals (Neem, Mahogany and Karanja oils) and a microbial pesticides (Beauveria bassiana) for the management of mango hopper (Idioscopus clypealis). The experiment was designed following completely randomized design (CRD) using 39 petridishes of 12 cm in diameter. Four insecticides each with 3 different doses (1%, 2% and 3%) were evaluated for their effectiveness. The data on the number of hopper killed were collected every day of a week. Results showed that all the three doses of Beauveria bassiana effectively controlled mango hopper. All the treatments influenced significantly in the management of mango hopper in comparison to ...
Bookmarks Related papers MentionsView impact
Asian J. Med. Biol. Res., Dec 31, 2019
Mango hopper is considered as one of the most destructive pests of mango in Bangladesh which can ... more Mango hopper is considered as one of the most destructive pests of mango in Bangladesh which can be effectively controlled by using bio-agents and botanical pesticides. An experiment was conducted at the IPM Laboratory of the Department of Entomology, Bangladesh Agricultural University, Mymensingh, Bangladesh to study the comparative performance of three botanicals (Neem, Mahogany and Karanja oils) and a microbial pesticides (Beauveria bassiana) for the management of mango hopper (Idioscopus clypealis). The experiment was designed following completely randomized design (CRD) using 39 petridishes of 12 cm in diameter. Four insecticides each with 3 different doses (1%, 2% and 3%) were evaluated for their effectiveness. The data on the number of hopper killed were collected every day of a week. Results showed that all the three doses of Beauveria bassiana effectively controlled mango hopper. All the treatments influenced significantly in the management of mango hopper in comparison to ...
Bookmarks Related papers MentionsView impact
Journal of Health and Pollution
Background. Population growth has led to the need to increase global food production. Pesticides ... more Background. Population growth has led to the need to increase global food production. Pesticides are an important tool used in efforts to control insect pests. About 20–30% of agricultural produce is lost annually due to insect pests, diseases, weeds and rodents. While pesticides are effective against pest populations, if used injudiciously, they may pose health hazards to humans, domestic animals, natural enemies of crop pests and other forms of life through unwanted contamination of food, feed, water bodies and the environment. Objectives. The aim of the present study was to examine farmers' level of knowledge and awareness of environmental pollution due to unsafe use of pesticides for controlling rice pests and to explore ways of reducing their usage. Methods. The research population consisted of 120 rice farmers: 40 farmers randomly selected from each of the three rice growing districts of Bangladesh; Mymensingh, Tangail and Jamalpur. Data was collected through group discuss...
Bookmarks Related papers MentionsView impact
Journal of Insect Behavior
The brown planthopper (BPH), Nilaparvata lugens (Stål) (Homoptera: Delphacidae) is a major pest o... more The brown planthopper (BPH), Nilaparvata lugens (Stål) (Homoptera: Delphacidae) is a major pest of many rice growing countries worldwide. It has been observed that one rice field is severely infested by BPH while an adjacent field left untouched. We hypothesized that differences in nutrient content in rice plants may explain this behavior. BPH feeding and oviposition behavior was evaluated on rice plants that had been grown under a range of fertilizer treatments. Tissue samples from experimental rice plants were analyzed for percent N, P, K, Si, free sugars and soluble proteins which were regressed with BPH host choice parameters. A completely randomized design with four replications in a factorial scheme was used in experiments where levels of soil N, P and K were taken as factors. Nymph feeding preference did not differ significantly among different nutrient treated rice plants. Adult females preferred to feed and oviposit on rice plants fertilized with N but it showed negative preference with K supplementation, while P had no marked effect. The position of feeding and ovipositing shifted gradually from lower to upper of leaf sheath and then to leaf blade with decrease of N fertilization to the rice plant. Host choice of BPH for feeding and ovipositing were positively associated with plant tissue concentrations of N, total free sugars and soluble proteins, negatively with Si but not with P and K. Plant tissue biochemical those are associated with BPH host preference may regulate how fast and where they settle on a rice plant.
Bookmarks Related papers MentionsView impact
Scientific reports, Jan 5, 2017
Rice (Oryza sativa L.) is the primary staple food source for more than half of the world's po... more Rice (Oryza sativa L.) is the primary staple food source for more than half of the world's population. In many developing countries, increased use of fertilizers is a response to increase demand for rice. In this study, we investigated the effects of three principal fertilizer components (nitrogen, phosphorus and potassium) on the development of potted rice plants and their effects on fitness traits of the brown planthopper (BPH) [Nilaparvata lugens (Stål) (Homoptera: Delphacidae)], which is a major pest of rice in Bangladesh and elsewhere. Compared to low fertilizer inputs, high fertilizer treatments induced plant growth but also favored BPH development. The BPH had higher survival, developed faster, and the intrinsic rate of natural increase (r m ) was higher on well-fertilized than under-fertilized plants. Among the fertilizer inputs, nitrogen had the strongest effect on the fitness traits of BPH. Furthermore, both the "Plant vigor hypothesis" and the "Plant st...
Bookmarks Related papers MentionsView impact
Uploads
Papers by Prof. Dr. Mahbuba Jahan