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ABSTRACT: The production of the brinjal is hampered due to severe infestation by epilachna beetle. The experiment was conducted to investigate the abundance of epilachna beetle on brinjal at Patuakhali Science and Technology University (PSTU) campus during January to May 2022 and to determine the effectiveness of different insecticides on mortality and leaf consumption. Three treatments viz., T1 = Caught 10 EC @ 1 mlL-1 of water, T2 = Bioclean (D-Limonin 5% M L) @ 1 mlL-1 of water, T3 = Fyfanon 57 EC @ 1 mlL-1 of water and an untreated control. Results revealed that the highest number of grub (31.5) and adult (2.06) per plant was recorded in May while the lowest in January. The highest leaf area (35%) consumed by the grub was observed at 72 hours after release (HAR) followed by 48 HAR (28%) but the lowest (23%) in 24 HAR. Similar trend was also observed in leaf area consumed by adult beetle at 72, 48 and 24 HAR. The mortality of grub and adults were recorded 100% from the leaf treated by T1 (Caught 10 EC @ 1 ml L-1 of water), T2 (Bioclean (D-Limonin 5% M L) @ 1 mlL-1 of water) and T3 (Fyfanon 57 EC @ 1 mlL-1 of water) while no mortality was observed in the untreated control. No leaf consumption by epilachna beetle was observed after 24 hours of release when treated by T1 (Caught 10 EC @ 1 mlL-1 of water), T2 (Bioclean (D-Limonin 5% M L) @ 1 mlL-1 of water) and T3 (Fyfanon 57 EC @ 1 mlL-1 of water) while 24% and 17% leaf consumption by grub and adult, respectively in the untreated control. Though all these treatments were effective for controlling epilachna beetle but Bioclean could be the best option for ecofriendly management.
Keywords: Epilachna beetle, Incidence, leaf consumption, insecticidal efficacy.
Post Time: 2 months ago
Abstract: The biological parameters of Neoseiulus longispinosus feeding on Tetranychus urticae were examined at the IPM lab of Entomology Division, Bangladesh Agricultural Research Institute (BARI), Gazipur following leaf disc method during March - April 2022 at 25±20C and 55±5% RH. Results revealed that the average incubation period for eggs were 2.37 days, whereas larval, protonymphal and deutonymphal average periods for male and female were 0.64 and 0.73days, 0.85 and 1.02 days, and 1.03 and 1.13 days, respectively. The total developmental period from egg to adult of predatory mite was 4.79 days for female and 4.09 days for male. Pre oviposition, oviposition and post oviposition periods were 2.25±0.06, 11.04±0.47 and 2.41±0.12 days, respectively. Morphometric measurement indicated that a gradual increase of female in size from larva to adult were larger than male. On an average female longevity was 14.74 days and male longevity was 18.12 days. Female averagely laid on 27.13±1.49 eggs in its life span when reared on T. urticae under laboratory conditions.
Keywords: Two spotted red spider mite, taro, protonymph, deutonymph, adult, longevity, fecundity, morphometric measurement.
Post Time: 2 months ago
ABSTRACT: The study was undertaken from June 2021 to February 2022 in the field and laboratory of the Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh to assess the effect of four biopesticides (Fytomax PM, Neem oil, Spinomax SC 44.03%, and Bio-chamak 1% EW) and one conventional insecticide (Ripcord 10 EC). Investigation was carried out on the repellency and mortality effects of tested insecticides against brinjal shoot and fruit borer (BSFB) (Leucinodes orbonalis) and their impact on brinjal production. The repellency rate of adult BSFB at 24 hours after treatment (HAT)was the highest (72.2%) on Spinomax SC 44.03% while the lowest (17.7%) was on Fytomax PM. Mortality rates of the BSFB larvae at 24 and 48 HAT with Spinomax SC 44.03% were 23 to 38%, respectively which were statistically similar to that of Ripcord 10 EC (19.1% and 33.4%, respectively). Spinomax SC 44.03% revealed higher mortality rates of the larvae at 72, 96 and 120 HAT. Spinomax SC 44.03% and Ripcord 10 EC treated plants revealed statistically similar mortality and provided the highest plant height, branches and fruits per plant, fruit length, diameter and weight. Among the insecticides, Spinomax SC 44.03% showed the highest yields (15.5 t ha-1) and benefit cost ratio (3.9). The findings indicated that application of Spinomax SC 44.03% to control BSFB infestation was the best one ensuring maximum yield.
Keywords: Leucinodes orbonalis, mortality, pesticide, Solanum melongena.
Post Time: 2 months ago
ABSTRACT: Study was carried out in the farmer’s field at Sonakhali, Barguna sadar, Barguna district of Bangladesh during January to April 2017 to evaluate the impact of different ecofriendly treatments against pod borers of mungbean. Variety Barimung 6 was used as study material. Results revealed that the lowest mean number of pod borer (1.75 Plot-1 at 50 DAS & 2.50 plot-1 at 60 DAS), the highest percent of pod borer reduction (72.0% at 50 DAS & 72.22% at 60 DAS) over control, the lowest mean pod damaged (4.00 m2 at 50 DAS & 6.50/m2 at 60 DAS) and the highest percent of pod damage reduction (76.12% at 50 DAS & 74.25% at 60 DAS) over control were found in plots treated with Virtako 80 WG @ 0.15g L-1 of water. The highest yield (1075.00 kg ha-1) and net return (Tk. 14425 ha-1) were obtained from Virtako 80WG treated plot while the highest marginal benefit cost ratio (2.67) was obtained from Raise 20 SL treated plots. From this study Virtako 80 WG @ 0.15g L-1 of water was found to be the best option for the suppression of pod borers and produced maximum yield of mungbean. Raise 20 SL @ 3ml L-1 of water at 40 DAS gave the highest marginal benefit cost ratio. Hence it could be the best option as second choice to suppress pod borers in mungbean.
Keywords: Ecofriendly options, benefit cost ratio, Pest incidence, Vigna radiata.
Post Time: 2 months ago
ABSTRACT: The vegetable growers are facing serious problem to legume pod borer, Maruca vitrata F. (Lepidoptera: Crambidae), the most destructive pest of yard long bean. The experiment was conducted during February to June 2022 in the experimental field of the Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur. Four insecticidal treatments, Lambdacyhalothrin + Profenofos (ACC-35) (T1), Emamectin benzoate (Noclaim 5 SG) (T2), Spinosad (Success 2.5 SC) (T3), Azadirachtin (Neemoz 0.1%) (T4) and an untreated control (T5) were evaluated against M. vitrata. All the insecticide treatments were found promising against the pod borer as compared to untreated control. However, the highest number of healthy pods plant-1 (15.56, 13.89 and 13.22) were found from Spinosad @ 0.60 ml L-1 of water treated plots while the lowest (4.78, 4.33 and 4.89) in the untreated control after 1st, 2nd and 3rd spray, respectively. The highest pooled mean healthy pods were obtained as 97.40, 94.01 and 101.86 g from Spinosad @ 0.6 ml L-1 of water treated plot but the lowest as 29.85, 29.67 and 36.13 g in the untreated control at 5, 10 and 15 days, respectively after 1st, 2nd and 3rd spray. The highest pooled mean protection over control were recorded as 87.29, 85.33 and 88.33% from Spinosad @ 0.6 ml L-1 of water treated plot while the lowest were 60.09, 40.01 and 62.07% from Lambdacyhalothrin+ Profenofos at 5, 10 and 15 days, respectively after 1st, 2nd and 3rd spray. Hence, farmers can use these tested insecticides especially Spinosad for effective management of M. vitrata in yard long bean.
Keywords: Legume pod borer, Lambdacyhalothrin, Profenophos, Spinosad, Emamectin benzoate, Azadiractin.
Post Time: 2 months ago
ABSTRACT: There are many constraints in chickpea production, of which pod borer, Helicoverpa armigera Hubner is the most notorious pest which causes both quantitative and qualitative loss. Therefore, the study was conducted at the research field of Plant Pathology and Seed Science Department, Faculty of Agriculture, Sylhet Agricultural University (SAU), Sylhet, Bangladesh to evaluate the effectiveness of different synthetic insecticides and natural botanicals against the pod borer attacking chickpea during 25 November, 2018 to15 April, 2019. The six treatments viz., spraying of lamda-cyhalothrin @ 1.5 ml L-1 of water, chloropyrifos + cypermethrin @ 2 ml L-1 of water, chlorantranilprole @ 0.15g L-1 of water, neem leaf extract (1:4), bishkatali leaf extract (1:4), marigold leaf extract (1:4), and untreated control (water sprayed only) were evaluated in this experiment. The parameter viz., pod damage (%), number of pod plant-1, number of bored pod per 10 infested pods, plant height (cm), number of branch plant-1, weight of 1000 seeds (g), yield of chickpea (t ha-1) were investigated to evaluate the treatments against the pod borer. Results indicated that lamda-cyhalothrin was found as most effective insecticide because it caused the highest pod damage reduction over the untreated control (72.53%) and provided the highest yield (1.6 t ha-1) and highest marginal benefit cost ratio (MBCR) (4.60). Thus, it may be concluded that spraying of lamda-cyhalothrin may be an effective management practice against the chickpea pod borer.
Keywords: Chickpea, pod borer, control, MBCR, economics.
Post Time: 2 months ago
ABSTRACT: The Oligonychus coffeae (Acari: Tetranychidae), known as tea red spider mite, is one of the major pests of commercial tea (Camellia sinensis (L.) O. Kuntze) plantation in the world. The aim of this study was to find out the tolerance of seven tea clones (BT1, BT2, BT8, BT19, BT20, BT21 and TV1) against the red spider mite and to know the influence of temperature, rainfall and relative humidity on red spider mite at Sylhet Agricultural University campus, Sylhet, Bangladesh during November 2021 to July 2022. The leaf infestation ranged 6.2% to 22.1% where the highest leaf infestation (22.1%) was recorded in BT2 clone while the lowest leaf infestation was 6.2% in BT21 followed by BT19 (7.8%). Similarly, the highest chlorophyll reduction (51.1%) was recorded in BT2 while the lowest reduction was in BT21 (21.8%) followed by BT1 (26.9%) and BT8 (27.5%). The results clearly indicated that the clones BT19 and BT21 are higher tolerant against the red spider mite while BT2 clone is the most vulnerable to this pest. No remarkable influence of rainfall and relative humidity on the population dynamics of red spider mite and percent leaf infestation was noticed, but temperature tended to foster the leaf infestation, abundance of protonymphs, deutonymphs and adults of the tea red spider mite.
Keywords: Protonymphs, deutonymphs, adults, temperature, rainfall, humidity.
Post Time: 2 months ago
ABSTRACT: The study was conducted in four districts viz., Jessore, Mymensingh, Natore and Tangail to know the insecticide application pattern in T. Aman rice during July to November 2020. Data were collected from randomly selected 30 farmers of each district through a structured questionnaire. Farmers collected information mostly from extension people (40.0%) while insecticide doses from expert (57.5%) about insect pests control. They applied insecticides once/twice a season (85.8%) without reading the labelled information before spraying (80.0%) with hand operated sprayer (95.0%) before noon (63.3%). The respondents used partial protective measures, long pant/trouser, long sleeve shirts and took shower after handling insecticides at the rate of 70.0, 88.3, 80.0 and 58.3%, respectively during insecticide application. Of the respondents, 56.6% stored insecticides bottle/ packets in their living room while 69.1% left open after application. Health risks of the respondents were found to suffer from problem of skin, eye, gastrointestinal, urine and sexual, chronic diseases, physical weakness and breathing, and dizziness at the rate of 86.6, 130.7, 53.2, 11.6, 6.6, 70.0 28.3 and 3.3%, respectively. The study revealed that the farmers of Bangladesh are in at high risk of health hazards due to pesticide poisoning.
Keywords: Survey, disposal, safety measures, insecticides.
Post Time: 2 months ago
ABSTRUCT: A newly recorded spider of the genus Crossopriza Simon namely – C. lyoni (Blackwall) is described. The species is cosmopolitan and recorded for the first time from Khulna, Bangladesh. Generic diagnosis, description together with the distribution of the species are provided herewith.
Post Time: 3 months ago
ABSTRUCT: Panikachu (Colocasia esculenta) is one of the most important tuber crops commercially grown in all parts of the country. The crop has good potential for production in the wet season and can survive a certain period in flood water. It is a good source of carbohydrate and other nutrients, supplementing a diet that tends to be deficient during this particular period. The whole plant of panikachu including leaves, petioles, stolon and rhizomes are edible (Saha and Hussain 1983). Among the insect pests infesting Panikachu, leaf hopper, Amrasca biguttula biguttula Ishida; aphid, Aphis gossypii Glover; leaf roller, Tetranychus spp. and common cutworm, Spodoptera litura are reported earlier.
Post Time: 3 months ago
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