Bangladesh Journal of Entomology

Mango hopper management using selected insecticides

ABSTRACT: An experiment was conducted during 2022-23 mango cropping season with twelve treatments including an untreated control replicated thrice, in lac research station, BARI, Chapainawabganj. Treatments comprised of chlorpyriphos + cypermethrin 55 EC @ 1 ml/L of water; pryiproxifen + fenpropathrin 20 EC @ 1 ml/L of water; deltamethrin 2.5 EC @ 0.5 ml/L of water; chloropyfios + betacypermethrin 60 EC @ 1 ml/L of water; lambda-cyhalothrin 2.5 EC @ 1 ml/L of water; monomihypo + imidacloprid 80 WG @ 0.5 g/L of water; dinotefuran + pymetrozine 80 WDG @ 0.5 g/L of water; imidacloprid + lambda-cyhalothrin 20 SC @ 0.5 ml/L of water; indoxacarb + emamectin benzoate 25 WDG @ 0.1 g/L of water; cartap + acetamiprid 95 sp @ 1.5 g/L of water; imidacloprid 20 SL @ 0.5 ml/L of water and an untreated control. All insecticidal treatments have found superior over untreated control for the management of mango hopper. Imidacloprid 20 SL was found the best among all other treatnents for the management of mango hopper. The effectiveness of newer insecticides for the management of mango hopper was imidacloprid + lambda-cyhalothrin 20 SC, lambda-cyhalothrin 2.5 EC, monomihypo + imidacloprid 80 WG, dinotefuran + pymetrozine 80 WDG, deltamethrin 2.5 EC, chlorpyriphos + cypermethrin 55 EC, indoxacarb + emamectin benzoate 25 WDG, cartap + acetamiprid 95 SP, chloropyfios + betaCypermethrin 60 EC and cypermethrin 10 EC, respectively. The highest number of fruit retention was recorded in imidacloprid (1.83 fruits 10-1 inflorescences/tree) followed by imidacloprid + lambda-cyhalothrin (1.63 fruits 20-1 inflorescences/tree) and lambda-cyhalothrin (1.55 fruits 20-1 inflorescences/ tree) at mature stage. Gradual increase in number of mango hopper was found in untreated control. Overall results suggested that spraying of imidacloprid 20 SL @ 0.5ml/L of water performed better for controlling mango hopper and economic fruit retention compared to imidacloprid + lambda-cyhalothrin and lambda-cyhalothrin.

Keywords: Fruit, mango hopper, chemical insecticide, treatment.

Post Time: 2 years ago

Managment of brinjal shoot and fruit borer (Leucinodes orbonalis Guenee) with integrated pest management package(s)

ABSTRACT: The study was conducted to evaluate the performance of different IPM packages for management of brinjal shoot and fruit borer (BSFB) (Leucinodes orbonalis Guenee) in brinjal field during September 2015- February 2016. The tested IPM packages were package 1: clipping off infested brinjal shoot and fruit (mechanical control) + NSKE; package 2: clipping off infested shoot and fruit + NSKE + Rambo 10 EC; package 3: clipping off infested shoot and fruit + NSKE + Rekhaphos 20 EC; package 4: clipping off infested shoot and fruit + NSKE + Kinalux 25 EC; package 5: clipping off infested shoot and fruit + NSKE + Abamectin 1.8 EC; and an untreated control. The rates of shoot infestation at pre-fruiting and fruiting stages among the treatments ranged from 04.34%-14.09% and 01.92%-08.79% and the results differed significantly. All the IPM packages showed significantly lower rates of infestation compared to control and the package 2 had the lowest rates of infestation. The lowest fruit infestation of 10.55% by number and 09.08% by weight was recorded from package 2. The rate of reduction of fruit infestation over control was 71.75, 53.39, 53.02, 47.51, and 41.69% by number and 70.09, 52.07, 55.58, 49.36 and 45.10% by weight in package 2, package 3, package 4, package 5 and package 1, respectively. The marketable yield in different packages ranged from 19.53 – 38.76 t ha-1. The highest adjusted net return and BCR of Tk. 520488.10 and 9.23, respectively were obtained from package 2 treated plots. The second highest BCR of 5.0 was calculated from package 3, which was followed by package 5 (4.94) and package 1 (3.15) treated plot. The lowest BCR of 3.12 was found in package 4. The IPM packages 2, 3 and 5 were effective to suppress BSFB attacking brinjal shoot & fruit.

Keywords: Leucinodes orbonalis, insecticides, clipping, neem.

Post Time: 2 years ago

Documentation of pest status of coconut mite, Aceria guerreronis Keifer on infested coconuts

ABSTRACT: The coconut eriophyid mite was reported to cause damage in homestead coconut in southern region of Bangladesh. The study was conducted during the month of February to May 2016 and 2017 in selected places of six districts in southern region to documents the infestation levels of mite A. guerreronis Keirfer on coconuts. The infestation of eriophyid mites on the basis of percent plant infestation on coconut was more in Barisal and was ranged between 72.94% (Lakutia) to 91.44% (Bakergonj). But the lowest in Gotkhali, 65.77 of Barguna district during the year 2015-2016. During the year 2016-2017 the highest infestation was found in Pirozpur (Namazpur, 92.58%)) and the lowest infestation was in Barisal (Sikerpur, 79.60). However, the pooled mean of infestation levels of both years during 2015-2016 and 2016-2017 were more in Barisal and Pirozpur districts (90.34%).The mean percent coconut infestation level of eriophyid mites on the basis of district during the years 2015-2016 and 2016-2017 was the highest in Pirozpur (87.42%) followed by Bhola (86.76%), Jhalokati (86.44%), Patuakhali (86.33%), Barisal district (83.94%) and the lowest in Barguna (80.92%).

Keywords: Infestation levels, Coconuts, Coconut eriophyid mite, Barisal region.

Post Time: 2 years ago