Current Issue

Volume-1 | Issue - 1 | Continuous June 2020 to May 2021
Development of IPM modules using microbials and their derivatives for managing bean aphid, Aphis craccivora Koch - Research Article
Bean aphid is a serious pest which causes enormous loss of yield of country bean. An experiment was conducted at the Entomology Field Laboratory of Bangladesh Agricultural University, Mymensingh, Bangladesh during October 2018 to March 2019 to develop IPM modules using microbials and their derivatives and a botanical for managing bean aphid on IPSA Seem-2. IPM modules were evaluated based on different parameters viz. percentage of twig, flower and pod infestation at different time intervals and yield of marketable pod (ton ha-1). Eight treatments (seven IPM modules) viz. T1: Bt + Spinosad, T2: B. bassiana + Lufenuron, T3: Bt Abamectin, T4: Bt + Neem oil, T5: Bt + Lufenuron, T6: B. bassiana + Abamectin, T7: Bt + Buprofezin, T8: Control was included in the experiment. The experiment was laid out in RCB design with 3 replications of each treatment. The lowest infested twig, flower and pod were found 8.12, 4.55 and 5.13%, respectively at Beauveria bassiana + Abamectin sprayed plot after 1st spray. The efficacy of other IPM packages was more or less similar. After 2nd spray the lowest infested twig, flower and pod was observed 2.56, 1.73 and 2.16%, respectively at Beauveria bassiana + Abamectin sprayed plot. Similarly, after 3rd spray the lowest infested twig, flower and pod were 1.08, 0.47, and 0.78%, respectively at Beauveria bassiana + Abamectin sprayed plot.
Management of Litchi Fruit Borer,Conopomorpha sinensis Bradley using Biorational Insecticides - Research Article
Background and Objective: Of all the fruits available in the market during the months of May-June in Bangladesh, fresh Litchi is always of very high demand due to its unique taste, flavour and colour. But the cultivation of this juicy and delicious fruit is affected quite frequently by a number of insect pests of which Litchi Fruit Borer (LFB), Conopomorpha sinensis Bradley (Lepidoptera: Gracillariidae) is the most common. This study was made to evaluate some bio-rational insecticides for managing LFB to prepare from natural sources which are safer and less toxic to human and animals than chemical one’s. Materials and Methods: Experiments were carried out in the litchi orchard consecutively for two years at Gopalpur, Tangail, Bangladesh. Four botanicals and two natural fermentation products were sprayed as treatments on litchi tree to follow randomized complete block design with 3 replications. An untreated control was also maintained to compare the effect of treatments. Results: Spinosad showed the least fruit infestation (2.84%) followed by Abamectin (5.69%), Neem leaf extract (11.33%) and the rest more than 12%. Among the tested insecticides, Spinosad, Abamectin and Neem leaf extract were found to be the most efficient on infestation reduction 95.28%, 90.54%, 81.17% with increase fresh fruit 59.01%, 57.77%, 55.08%, respectively but economically higher benefit was obtained from Neem leaf extract (10.84:1) and Abamectin (9.75:1).
Relative efficacy of some chitin synthesis inhibitors in reducing growth and development of okra jassid, Amrasca biguttula biguttula (Ishida) - Research Article
Chitin synthesis inhibitors (CSIs) are chemically diverse compounds that disrupt molting process by interfering chitin synthesis and kill insects before attaining maturity. In this study, some chitin synthesis inhibitors (CSIs) viz. tacoma 40SC (Buprofezin), heron 5EC (Lufenuron), pyrifen 10.8EC (Pyriproxifen) and chitosan 75WP were tested against okra jassid, Amrasca biguttula biguttula (Ishida) to elucidate their potential effects in arresting body growth and development. The nymphs of jassids was exposed to selected CSIs through different application methods like topical, leaf-dip and the combination of both topical and leaf-dip. Weight data was collected at 7 days after treatment (DAT) application. Results showed that all of the CSIs except chitosan had significant effect on the body weight reduction of okra jassid. Growth reduction was clearly concentrations and application method dependent. It has shown that higher concentrations were found to be more effective than lower concentrations. Bioassay study has showed that all the selected CSIs became able to enter in the insect body through contact as well as stomach action to disrupt molting process by inhibiting chitin synthesis that confirmed the contact and systemic actions of the selected CSIs.