Promoting a Sustainable Future Through Research, Collaboration, and Education
Safeguarding Ecosystems, Empowering Communities, and Shaping Environmental Policy
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: In the present study the effect of different adult diets on the longevity of sterile oriental fruit fly, Bactrocera dorsalis (Hendel) was compared under controlled laboratory condition. Adult flies were provided with protein diet + water and sugar diet as pre-release supplements for five days after adult emergence and then transferred to four post-release diet treatments viz., (i) protein diet + water, (ii) sugar diet (20% sugar solution), (iii) only water and, (iv) nill (without food and water) and their longevity was recorded until death. Experimental results revealed that flies had comparatively longer lifespan on sugar diet than protein diet when either protein or sugar used as pre-release diets. Flies died within two days while provided only water and one to two days without food irrespective of any pre- release supplements. The experimental findings were discussed in the light of possible use in Sterile Insect Technique (SIT) of B. dorsalis.
Keywords: Bactrocera dorsalis, Sterile Insect Technique, adult diet, longevity.
Post Time: 2 years ago
ABSTRACT: The study was conducted in order to find out an effective spray schedule of cypermethrin insecticide against pod borer, Maruca vitrata F. attacking summer country bean. Including an untreated control there were six treatments were used to measure the effectiveness of cypermethrin based on inflorescence and pod infestation, yield and also benefit cost ratio (BCR). Among the different spray schedules of cypermethrin, the lowest rate of pod infestation (4.59% by number and 6.10% by weight) and the highest BCR (6.98) were obtained with Ripcord (cypermethrin) 10 EC @ 1 ml l-1 of water sprayed after observing 5% level of pod infestation and repetition of the same at 15 days interval up to last harvest. On the other hand, highest marketable yield (11.64 t ha-1) was obtained Ripcord (cypermethrin) 10 EC @ 2 ml l-1 of water sprayed after observing 5% level of pod infestation and repetition of the same at 15 days interval up to last harvest but the BCR was lower (4.21) compare to the application rate 1 ml l-1 of water. So, Ripcord (cypermethrin) 10 EC @ 1 ml l-1 of water sprayed after observing 5% level of pod infestation and repetition of the same at 15 days interval up to the last harvest performed the best.
Keywords: Spray schedule, Cypermethrin, Maruca vitrata, Summer country bean.
Post Time: 2 years ago
ABSTRACT: This study evaluated the effect of Tracer 45 SC, Vertimec 18 EC, neem seed kernel extract, neem leaf extract with concentration of 1.2 ml l-1, 0.4 g l-1, 50 ml l-1 and 50 g l-1 water, respectively and hand picking along with an untreated control against pod borer Maruca vitrata infestation on green pea Pisum sativum. Application of the treatments was started from the advent of pod borer infestation and repeated three times with 15 days interval. The treatments revealed pod infestations from 4.2 to 6.0%, 1.3 to 2.7% and 4.9 to 8.3%, respectively at early, mid and late harvest which are statistically lower compared to untreated control. The treatments produced significantly longer (5.6 to 6.1 cm), wider (1.14 to 1.24 cm) and heavier (0.64 to 0.90 g pod-1) pods as well as higher number of seed (3.0 to 3.4) per pod. The marketable yield (862.1 to 1033.7 kg ha-1) and gross yield (884.3 to 1047.0 kg ha-1) were statistically higher in the treatments and the infested yield (33.7 kg ha-1) was highest in the untreated control. The treatments produced revealed 13.1 to 35.6% marketable yield over control. An economic analysis indicated that the highest gross return (837.6 US dollar ha-1) was obtained from the Tracer 45 SC treated plot but net return (760.2 US dollar ha-1), adjusted net return (123.4 US dollar ha-1) and benefit cost ratio (1.7) were highest in the Vertimec 18 EC treated plot. The results indicated the insecticidal treatments were more potential compared to botanical and mechanical control against pod borer.
Keywords: Maruca vitrata, neem extracts, neem oil, Pisum sativum, Tracer, Vertimec.
Post Time: 2 years ago
ABSTRACT: The effects of CB1, CB3, CB5, CB8 and CB12 cotton varieties on the growth, morphometric parameters and life length of the armyworm Spodoptera litura Fabricius (Lepidoptera: Noctuidae) were studied under laboratory conditions. The growth of the larvae differed significantly and was the highest on CB8. The larvae that fed on CB1, CB3 and CB12 revealed statistically similar and lower growth rate. The morphometric parameters of S. litura as a result of feeding on five cotton varieties revealed that the larger egg masses were laid on CB5. the varieties showed statistically significant effects on length, width and weight of different larval instars. the larvae fed on CB8 molted to bigger-sized pupae, and emerged as heavier adults. the life lengths of the male and female insects were longest on CB8 however the female showed statistically similar result on CB5. the CB8 followed by CB5 revealed suitability as the host plant of S. litura, and such varieties are less suitable for cultivation in areas where army worm is a major pest.
Keywords: Cotton varieties, Spodoptera litura, morphometric, growth, life length.
Post Time: 2 years ago
ABSTRACT: Effect of six different weed extracts on the repellency and oviposition deterrent were conducted against cucurbit fruit fly, B. cucurbitae (Coq.) in the laboratory of the Department of Entomology, HSTU, Dinajpur, during July to December 2021. The study was carried out primarily with 5.0 % concentration for six weed extracts followed by two weed extracts with four concentrations (0.5, 1.0, 2.0 and 4.0 %) on bitter gourd fruit. Results indicated that the tested weed extracts not only cause repellent and oviposition deterrent effects against B. cucurbitae but also inhibited the progeny development. The lowest number of larvae (0.67) and pupae (0.67) recovery and adult emergence (0.33) was recorded from water pepper weed extract at 5.0% concentration followed by croton weed extract. The order of toxicity of the weed extracts based on repellency and oviposition deterrent was water pepper > croton > black nightshade > goat weed > common lucas > mexican poppy. However, progeny recovery, percent repellency and oviposition deterrent were found dose dependent manner. The highest repellency (53.05%) and oviposition deterrent (95.40%) were found in water pepper as against the lowest repellency (28.73%) and oviposition deterrent (44.96%) was in common lucas. The highest percent reduction of pupae recovery was observed in water pepper (97.53%) whereas the lowest was in mexican poppy weed extract (63.86%). The water pepper weed extract also showed the highest inhibition of adult emergence (98.72%). It is evident from the results that all the weed extracts caused a remarkable decrease in adult emergence, larvae and pupae recovery, and adult settling compared to control.
Keywords: Bactrocera cucurbitae, weed extract, repellent, oviposition deterrent, progeny development.
Post Time: 2 years ago
ABSTRACT: The study was conducted from September 2019 to December 2020 to know the effects of the new generation insecticides, Virtako 40WG (Chlorantraniliprole and Thiamethoxam) and Coragen 18.5SC (Chlorantraniliprole) on the infestation of rice yellow stem borer (Scirpophaga incertulas) and dark headed stem borer (Chilo suppressalis) and yield of rice. The insecticides with concentrations 0.1, 0.5, 2, 10, 50 and 200 ppm were applied along with an untreated control. Rice plants were cultivated in the experimental field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh. All doses of the insecticides resulted significantly lower level of plant infestation. Virtako 40WG and Coragen 18.5SC at concentrations of 200 ppm showed the lowest levels of dead heart (3.0% and 2.0%, respectively) and white head (2.7% and 2.2%, respectively) symptoms. All the doses of the insecticides produced significantly the higher yield of rice compared to untreated control and the dose 200 ppm produced the highest yield.
Keywords: Aman rice,Chilo suppressalis, Coragen 18.5SC, Scirpophaga incertulas, Virtako 40WG.
Post Time: 2 years ago
ABSTRACT: The experiment was carried out during winter 2019 in the field of Agricultural Training Institute, Sylhet, Bangladesh to find out the effective ecofriendly insecticides to control fruit borer Helicoverpa armigera Hub. attacking tomato plants. The study was conducted with three treatments viz., Bacillus thuringiensis @ 2.0 mg L-1, Spinosad 45 SC@ 0.4ml L-1, Abamectin 1.8 EC @ 1.2 ml L-1 of water and untreated control. Results revealed that the number of healthy fruits increased by 72.85% over control due to spraying of Spinosad 45 SC and it was followed by Bacillus thuringiensis (32.78%) and Abamectin 1.8 EC (26.82%). The highest number of healthy fruits (274.00) was harvested from Spinosad 45 SC treated plot and the lowest number (100.6) from untreated control plot. The yield in different treatments ranged from 12.43 -17.58 t ha-1. The highest adjusted net return (Tk. 225800.70) and BCR (Tk. 8.74) were obtained from Spinosad 45 SC treated plot. The second highest BCR of 8.70 was calculated from Bacillus thuringiensis (Bt) treated plot and the lowest BCR of 5.02 was found in Abamectin 1.8 EC treated plot. All the treated insecticides reduced the infestation of fruit borer, but Spinosad 45 SC was found most effective.
Keywords: Helicoverpa armigera, Solanum lycopersicum, yield, benefit-cost ratio, biorational and microbial
Post Time: 2 years ago
ABSTRACT: In the present study, five botanical oils namely sesame, castor, groundnut, pongamia and black cumin were tested against the adult of Aphis craccivora Koch to evaluate the toxic and repellent effects under laboratory conditions (25 ± 5° C, 65-75% RH). Four concentrations (1.5, 2.0, 2.5 and 3.0%) along with on untreated control were utilized for the toxic and repellent study. Results indicated that all the botanical oils had different levels of toxic and repellent effects and found effective against the aphid. Among the tested botanical oils, the highest (40.50%) mortality was found in sesame oil while the lowest (30.50%) in black cumin oil against the aphid. The lowest LD50 values for sesame oil were found as 28.093, 4.529, 0.945 and 0.179 % at 12, 24, 36 and 48 HATs, respectively. Mortality percentages were dose dependent and proportional to the hours after treatments. The highest LD50 values were observed as 586.05, 14.860, 2.856 and 2.373% at 12, 24, 36, and 48 HATs, respectively for black cumin oil. Sesame oil also showed the highest repellent effect (69.00%) i.e., repellent class IV among all the botanical oils applied. On the contrary, black cumin oil showed the lowest repellent (33.33 %) effects, i.e., repellent class II. The order of toxicity was found as sesame oil > castor oil > groundnut oil > pongamia oil > black cumin oil considering all the concentration and efficacy. Therefore, among the tested oils sesame oil might be tested in field condition against the A. craccivora.
Keywords: Toxicity, repellenency, botanical oils, Aphis craccivora.
Post Time: 2 years ago
ABSTRACT: The study was conducted with BD-7320, BD-7328, BD-9952, BD-10154, BD-10158, BARI Begun-1, BARI Begun-4, BARI Begun-5, BARI Begun-6, BARI Begun-7, BARI Begun-8 and BARI Begun-9 germplasm lines of brinjal with a view to understanding the resistant behavior of plant morphological characteristics and phytochemical contents to aphid infestation. The experiment was conducted at Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during September 2018 to March 2019. The abundance of aphid among the germplasm lines varied significantly, and was the lowest and statistically similar on BD-9952, BARI Begun-6 and BARI Begun-4. The abundance of aphid on BARI Begun-8 and BD-10158 showed significant positive correlation with plant height, branch/plant, leaf/plant and leaf area, but had significant negative association with abaxial and adaxial leaf trichomes, spine/stem and spine/leaf. The phytochemical content of leaf like moisture, total chlorophyll, proline, reducing sugar, total sugar and protein content had positive effect on the abundance of aphid, whereas pH and ash content of leaf had negative correlation. The infestation level of aphid varied significantly among twelve germplasm lines where BD-9952, BARI Begun- 6 and BARI Begun- 4 depicted statistically similar and the lowest infestation of aphid.
Keywords: Solanum melongena, morphological characters, phytochemicals, Myzus persicae.
Post Time: 2 years ago
ABSTRACT: The study was carried out using four botanical oils such as neem, (Azadirachta indica) pithraj, kalozira (Black camin) (Nigella sativa) and tishi (Linseed) (Linum usitatissimum) to manage red pumpkin beetle Aulacophora foveicollis attacking sweet gourd. Data were taken on the number of red pumpkin beetle on a twig per plant and fruits yield. The number of insects reduced with increasing time after spray of botanical oils. The number of insect per plant markedly reduced up to 72 hours of spray but best result was observed at 24 and 48 hours after application of treatments. For every spray the highest number of insect was observed 7 days after spray. The results of the present study revealed that among all the tested botanical oils black cumin had promising effect against the beetle at 7 days after spray. Based on the number of fruits per plant black cumin oil may be used as an effective management option against A. foveicollis.
Keywords: Black cumin, neem, Linseed, Pithraj, oils, red pumpkin beetle, Sweet gourd.
Post Time: 2 years ago
Bangladesh Journal of Entomology © All Rights Reserved.
Developed by ToLearnTeam