Promoting a Sustainable Future Through Research, Collaboration, and Education
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From Research to Action - Protecting Natural Resources and Fostering Sustainability
Collaboration, Education, and Advocacy for a Sustainable Future
Securing a Thriving Environment for Generations to Come Through Research and Education
ABSTRACT: Taxonomic account of two species of rice-plant inhabiting long-jawed spiders genus Tetragnatha Latreille, 1804 are presented. Of these, species T. okumae n. sp. is identified as new to science and T.boydi Cambridge is recorded first time from the area of present study. Brief generic diagnosis together with illustrated description, distribution and key to the species is provided. The web-building behaviour of the new species is briefly discussed.
Keywords: Tetragnatha, T. okumae, T. boydi, Araneae, Tetragnathidae, Tetragnathinae
Post Time: 5 months ago
ABSTRACT: Experiment was carried out to evaluate the effectiveness of four IPM packages and an untreated control against leaf beetle of French bean. Results revealed that the lowest number of plant infestation by leaf beetle and the highest per cent (82.88%) of plant infestation reduction over control was found in package 1 (Yellow sticky trap + Bioneem plus) treated plots at 38, 48 and 58 days after sowing (DAS). The lowest mean number of leaf beetle (1.05/Plant) and the highest percentage of leaf beetle population reduction (79.00%) over control were recorded from package 1. The lowest percent leaf area damaged (2.19%) and the highest percentage (90.45%) of leaf area damage reduction over control was found in package 1 treated plots. There was a strong negative correlation of total yield with number of leaf beetle, percent plant infestation and percent leaf area damage package 1 comprising yellow sticky trap + Bioneem plus 1% EC @ 1ml/1litre of water was found to be the best integrated management package for the management of leaf beetle and produced maximum fresh pod yield (15180.50 kg/ha) and highest percent yield increase over control of French bean while the second highest (21.02) MBCR was obtained by adopting the package 1. Though the highest (33.91) MBCR was obtained by adopting the IPM package 3 but IPM package 1 could be the best package for the management of leaf beetle as eco friendly package.
Keywords: French bean, insecticides, IPM package, leaf beetle, yellow sticky trap
Post Time: 5 months ago
ABSTRACT: Cyclosia papilionaris (Durry 1773) is commonly known as the Drury Jewel moth. The larvae of this moth defoliate the delicate leaves of young trees and nursery plants of lotkon fruit (Burmese grape). There is a lack of sufficient biological information regarding the management of this pest. The aim of this study is to observe and record the developmental stages information (egg to adult) with descriptive images, including feeding behaviour and nature of damage. The biology of the moth was studied in laboratory conditions on their host plants. The study was carried out at a temperature of 27.61°C ± 3.85 and 69% ± 4.58 relative humidity. The female deposited eggs in clusters, and each cluster contains a maximum of 68 eggs and a minimum of 18 eggs with the mean of 36. The total larval period (1st instar to 4th instar) was 20.09± 1.61 days, and the pupal period was 28.09± 6.56 days. The pupal cocoon was constructed using a plastic substrate combined with leaves, thus offering substantial support for the laboratory rearing method. The female moth lived longer, 17.82± 2.48 days, than the male moth, 5.73± 0.65 days. The results of this study are expected to provide valuable support for managing this pest in an agroecosystem.
Keywords: Morphology, Drury Jewel moth, Lepidoptera, Zygaenidae, Lotkon
Post Time: 5 months ago
ABSTRACT: Brinjal Solanum melongena Linn. is one of the most common and popular vegetables grown throughout the year in Bangladesh. The study was carried out in homestead garden of Patuakhali Science and Technology University (PSTU) campus, Dumki, Patuakhali to determine the influence of abiotic factors on sucking pests of brinjal during the period from December 2017 to March 2018. In foggy condition, the highest number of aphid was observed in top canopy followed by whiteflies and jassid while lowest was the mealy bug, but in clear sunshine weather condition, the highest number of jassid was recorded in top canopy followed by aphid and whiteflies while the lowest was the mealy bug. A positive and linear relationship was observed between mean aphid population with the temperature in brinjal host while a negative and linear relationship was observed between mean whitefly and jassid population with the temperature. A positive and linear relationship was observed among mean aphid, jassid and whitefly population with the relative humidity. A strong positive and linear relationship was observed between mean mealy bug and red spider mite population with the temperature and relative humidity.
Keywords: Aphids, jassids, whitefly, mealybugs, temperature, relative humidity, rainfall
Post Time: 1 year ago
ABSTRACT: The sustainable development of Bacillus thuringiensis (Bt)-based biopesticides against Zeugodacus tau, a destructive vegetable pest susceptible to Cry proteins, necessitates extensive laboratory and field-scale bioassays to replace hazardous chemical pesticides. In this study, 44 indigenous Bt strains harbouring various cry genes were evaluated against early third-instar larvae of Zeugodacus tau (Walker) (Diptera: Tephritidae: Dacinae) following enhanced Cry protein expression in T3 broth. Among the tested strains, nine demonstrated >70% larval mortality, with Bt JSd1 (92%), SaS6 (85%), JDc1 (83%), TaSa4 (75%), RaSa2 (74%), NaSc3 (72%), Ksa2 (72%), FhSb3 (70%), and MuSc2 (70%) showing the highest efficacy. Probit analysis was used to determine the lethal concentration (LC₅₀, LC₉₉) and lethal time (LT₅₀, LT₉₉) of each strain. The lowest LC₅₀ was observed for Bt JSd1 (0.472 mg/ml), while the highest was for FhSb3 (0.753 mg/ml). LC₉₉ values ranged from 3.992 mg/ml (Bt JSd1) to 6.926 mg/ml (MuSc2). The shortest LT₅₀ was recorded for Bt JSd1 (55.17 hrs), while the shortest LT₉₉ was noted for Bt RaSa2 (241.73 hrs). Biological quality parameters, including minimum number of pupae, pupal weight, adult emergence, sex ratio (M:F), percent adult emergence, wing length, f light ability (% fliers), percentage of half-emerged and un-emerged individuals, and prolonged larval and pupal durations were all significantly affected in Z. tau infested bitter gourd and cucumber treated with the highly potent Bt JSd1 strain. In contrast, the control group exhibited the highest values for all quality parameters. Bt kurstaki HD-73 served as the reference strain in this study. The combined dose and time-dependent bioassay results, along with quality parameter assessments, identified Bt JSd1 as the most promising candidate for environmentally safe and effective control of Z. tau. Upon successful field validation, Bt JSd1 holds strong potential for large-scale production and sustainable application in integrated pest management strategies.
Keywords: Mortality, Quality parameters, Cry protein, Zeugodacus tau, Tephritidae
Post Time: 1 year ago
ABSTRACT: In the present experiment, the population density of insect pollinators and their influence on the fruit yield of litchi and sweet gourd were studied near Hajee Mohammad Danesh Science and Technology University campus, Dinajpur, Bangladesh from November 2019 to August 2020. Two treatments: open and net-pollinated plots were established in litchi orchards and sweet gourd field. Insect pollinator’s diversity was observed from 8.00 am to 16.00 pm with the interval of 2 hours for three successive weeks from the initiation of flowering until approximate 95% of the flower faded. Altogether 8 species of insects’ pollinators belonging to 2 different orders and 6 families in both litchi and sweet gourd flowers were recorded. Among them, Apis dorsata was recorded the most important pollinator in both litchi (47.93) and sweet gourd (49.53%). The peak foraging activities of majority of the insects were detected from 10.00 to 12.00am in both crops. Significant differences were observed on reproductive parameters of litchi and sweet gourd on open-pollinated over netted treatments. The increased yields were found in both opened pollinated litchi plants and sweet gourd than netted plants. Fruits inflorescence-1 and fruits weight inflorescence-1 (gm) were increased as 171.31 and 197.05%, respectively in open-pollinated litchi plant over netted plant. Similarly, single fruit weight, number of seeds and seed weight fruit-1 were increased as 200.00, 212.86, 216.38%, respectively in open-pollinated plant over netted sweet gourd.
Keywords: Pollination, litchi and sweet gourd flower, fruit yield, assessment, diversity
Post Time: 1 year ago
ABSTRACT: In Bangladesh about 51 insect species attack roses like thrips, aphid, mealy bug, whitefly, mites etc. Which causes damage to rose plant and reduce the quality of f lower. Most of the major and minor pests appeared in rose plant at the flowering stage with the maximum infestation. Fourteen species of insect pests belonging to 6 orders and 12 families were found to infest at different growth stages of rose. This experiment was carried out on insect pests of different growth stages attacking at rose at Godkhali, Jhikorgacha and Regional Agricultural Research Station (RARS), Jashore during November 2020 to June 2022. The rose variety namely, Jashore local was used. Among the insects, only four (4) namely, Aphid (Macrosiphum rosae), thrips (Rhipiphorothrips cruentatus), Rose bud borer (Helicoverpa virescens) and red spider mite (Tetranychus cinnabarinus) were recorded as the major pests while the rests were of minor importance on the basis of their population densities per plant, nature and extent of damage and flower yield reduction. Nine species of natural enemies belonging to 6 orders and 7 families were found to predate on different insect pests of roses and recorded in rose flower in the experimental rose garden. The population density per plant of major insects namely, aphid, thrips, rose bud borer and red mite was 25.75, 9.35, 1.25 and 12.65 per plant, respectively in 2021 and those of the insects was 27.45, 10.55, 1.75 and 14.55 plant-1, respectively recorded in 2022 in rose flower.
Key words: Aphid, thrips, rose bud borer, red mite, natural enemies, damage
Post Time: 1 year ago
AB STRACT: The study was carried out in homestead garden of Patuakhali Science and Technology University (PSTU) campus for the management of sucking pests of brinjal during the period from December 2017 to March 2018. Five treatments viz., T1 = Voliam flexi 300SC @ 0.5 ml/l of water, T2 = Bioneem plus 1EC @ 1 ml/l of water, T3 = Biotap plus extra 95EC @ 0.2 g/l of water, T4 = Yellow sticky trap and Untreated control were tested. In case of mealy bug and mite control, 4 treatments except yellow sticky trap were applied. Results revealed that the lowest number of aphid population (0.70/3 leaves) was found in brinjal plants sprayed with Voliam flexi 300SC (T1 ) while the control treatment had significantly the highest (3.66/3 leaves) aphid population in the top, middle and lower canopies of brinjal plants. Similar trend was also found in whiteflies and jassid populations by the same treatment. In terms of the percent population reduction over control, the highest reduction of aphid (86.22%), whiteflies (67.44%) and jassid (100%) was obtained from T1 followed by T2 and T3 in different canopies of brinjal plant. In case of mealy bug and red spider mite, no and lowest populations number of mealybug and red spider mite were found in brinjal plants sprayed with T1 and T3 while the highest number of mealybugs/ 3 leaves was recorded in control plants in all canopies. In terms of the percent mite population reduction over control, the highest reduction of mite was obtained from T1 (65.50%) and T3 (65.50%). Similar trend was also observed in middle and lower canopies. Voliam flexi 300SC @ 0.5 ml/l of water (T1 ) provided good control in reducing the populations of aphid, whitefly, jassid, mealy bug and red spider mite followed by T3 (Biotap plus extra 95EC @ 0.2 g/l of water) and T2 (Bioneem plus 1EC @ 1 ml/l of water) in different canopies of brinjal plant.
Keywords: Homestead Garden, brinjal, insecticides, management, sucking pests
Post Time: 1 year ago
ABSTRACT: The study was conducted in the experimental field of the Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur-1706 to evaluate the efficacy of seven bio rational insecticides against sucking pests (jassid, aphid and whitefly) on okra variety BARI Dherosh 2. The study was comprised of seven bio rational treatments vtz. Bio-Clean 5 SL (De- limonin) @1ml L-1 water, Biomax M 1.2 EC (Abamectine) @1ml L-1 water, Phytoclean (Potassium salt of fatty acid 40%) @10ml L-1 water, Bio-Action 1.5 SL (matrine) @3ml L-1 water, Spinomax 44.03 SC (Spinosad) @1ml L-1 water, Phytomax (Azadiractin 0.1%) @ 5ml L-1 water and Biotrin 0.5 AS (Matrine) @1ml L-1 water. The bio rational insecticides were applied six times at seven days interval during the okra growing season. Among the tested bio rational insecticides Biotrin 0.5 AS (matrine) @1ml L-1 water after 24, and 72 hours of application resulted the lowest jassid, aphid and whitefly abundance. Biotrin 0.5 AS (Matrine) @1ml L-1 water had greater effect on jassid, aphid and whitefly revealed significantly lower levels of leaf infestation by number.
Keywords: Abelmoschus esculentus, pests, beneficial arthropods, management
Post Time: 1 year ago
ABSTRACT: Mango production in Bangladesh is enormously affected due to the infestation of mango hopper Amritodus atkinsoni, a sucking insect belong to the family Cicadellidae under the order Hemiptera. Management of hopper in Bangladesh is purely based on different classes of synthetic insecticides. In the present study, four insecticides, namely Desis 2.5 EC (Deltamethrin), Ripcord 10 EC (Cypermethrin), Relothrin 10 EC (Cypermethrin), and Sumithion 50 EC (Fenitrothion) were evaluated against mango hopper infestation, fruit setting performance and assessed the effect of the insecticides on the abundances of natural enemies in mango orchard. The insecticides were applied four times maintaining recommended doses and 7-day intervals during the flowering period. A significant reduction of hopper population was observed in the treated mango plants compared to untreated control plants. Desis 2.5 EC and Sumithion 50 EC performed better than that of control and other tested insecticides considering the abundances of hopper populations as well as fruit settings. The applied insecticides had negative impact on the abundances of natural enemies. Decis 2.5 EC and Sumithion 50 EC were found comparatively safe than that of Relotrhin 10 EC and Ripcord 10 EC regarding the abundances of ladybird beetle, spider and wasp populations.
Keywords: Amritodus atkinsoni, Idioscopus, Insecticide, Mangifera indica.
Post Time: 1 year ago
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