Problem of flower shedding caused by thrips,<i>Megalurothrips distalis</i>(Karny), on summer mungbean,<i>Vigna radiata</i>(L.) Wilczek, and its control

Cheema

Egypt J Biol Pest Control

2020

Background Bean thrips, Megalurothrips distalis (Karny), are a serious insect pest of mung bean grown in summer season as a catch crop in wheat–rice cropping system in North West India. Severe incidence leads to flower shedding and fewer pods leading to loss in grain yield. Field studies were conducted to evaluate the efficacy of horticultural mineral oils, neem-based botanicals, and pongamia soap in the form of spray in comparison to the insecticide dimethoate in 2018 and 2019. Main body Randomized complete block design (RCBD) was used with 11 treatments including untreated control in 3 replications. Neem seed kernel extract (NSKE) at 5% gave the highest mean percent reduction in the number of thrips (90.44 and 79.59%), followed by 10 ml l−1 of Neem Kavach 1500 ppm (85.55 and 78.97%) and the insecticide dimethoate 30% EC at 250 ml ha−1 (84.92 and 78.22%) 1 and 3 days after treatment. Neem Baan 1500 ppm, Indo-Neem 1500 ppm, and Nimbecidine 300 ppm each at 10 ml l−1 also provided 75.29–82.42% and 61.18–75.82% reduction 1 and 3 days after treatment. Horticultural mineral oils also reduced the insect population by about 64%, while pongamia soap was least effective (31.58%) among botanicals. Dimethoate 30% EC at 250 ml ha−1 recorded the highest grain yield and net returns, followed by NSKE, Nimbecidine, and Neem Kavach that were on par with it. Homemade neem extracts evaluated in 2019 caused 62.7–77.3% reduction in thrips population up to 3 days after treatment with yields comparable to 10 ml l–1 of Indo-Neem spray. Conclusion The study indicated that neem extract was capable to manage the bean thrips in flowers of summer mung bean and obtained a high grain yield.

Section: Reduction Percentagementioning

confidence: 96%

Section: Yield and Percent Increase In Yield Over Untreated Controlmentioning

confidence: 99%

Field evaluation of horticultural mineral oils and botanicals against bean thrips, Megalurothrips distalis (Karny) (Thysanoptera: Thripidae), in summer mung bean

Cheema

Egypt J Biol Pest Control

2020

“…The three major genera that comprise this group all involve species that breed mainly in the flowers of Fabaceae. Species in two of them, Odontothrips and the Australian genus Odontothripiella, are rarely associated with crop plants, whereas several species of Megalurothrips are important as pests of bean crops in tropical and subtropical countries [57][58][59]. Two further genera that are possibly related to this genus-group are Ceratothripoides and Pezothrips [37].…”

Section: Megalurothrips Genus-groupmentioning

confidence: 99%

Problems with the Concept of “Pest” among the Diversity of Pestiferous Thrips

Mound

Wang

Lima

et al. 2022

Insects

Almost all of the thrips species that are considered pests are members of a single subfamily of Thripidae, the Thripinae, a group that represents less than 30% of the species in the insect Order Thysanoptera. Three of the five major Families of Thysanoptera (Aeolothripidae, Heterothripidae, Melanthripidae) are not known to include any pest species. The Phlaeothripidae that includes more than 50% of the 6300 thrips species listed includes very few that are considered to be pests. Within the Thripidae, the members of the three smaller subfamilies, Panchaetothripinae, Dendrothripinae and Sericothripinae, include remarkably few species that result in serious crop losses. It is only in the subfamily Thripinae, and particularly among species of the Frankliniella genus-group and the Thrips genus-group that the major thrips species are found, including all but one of the vectors of Orthotospovirus infections. It is argued that the concept of pest is a socio-economic problem, with the pest status of any particular species being dependent on geographical area, cultivation practices, and market expectations as much as the intrinsic biology of any thrips species.

Malaysian Journal of Halal Research

“…Several insect pests have been reported to infest mungbean and damage the seedlings, leaves, stems, flowers, buds, pods causing considerable losses [7,8,9]. The most damaging insect pests of mungbean recorded so far are stemfly [10,11], jassid [12,13], whitefly [14,15], thrips [14,16], hairy caterpillar [14] and pod borer [14,17]. Stemfly attack mainly the crop by feeding on tender stems at seedling stage, although it may attack at any stage of the crop.…”

Section: Introductionmentioning

confidence: 99%

“…Thrips is associated mostly with the damage of tender buds and flowers of mungbean [11]. Chhabra and Kooner [16] have reported extensive damage to the summer mungbean due to flower shedding caused by thrips.…”

Section: Introductionmentioning

confidence: 99%

Management Practices for Whitefly and Thrips in Mungbean

Alam

Ali

Hossain

et al. 2021

This experiment was conducted at the central farm of Sher-e-Bangla Agricultural University, [23.740 N latitude and 90.350 E longitude] Sher-e-Bangla Nagar, Dhaka, Bangladesh, during the period of March to May, 2014 to study the Whitefly and Thrips pest incidence in mungbean and their management practices BARI Mung-5 was used as the test crop for this experiment. The experiment consists of the following treatments: T1: Nitro 505EC (Chloropyrifos+Cypermethrin) @ 2 ml/L of water at 10 days interval; T2: Casper 5 SG (Emamectin Benzoate) @ 2gm/L; T3: Voliam Flexi (Thiamethoxam+Chlorantraniliprole) @ 0.25 ml/L; T4: Tapnor 40 EC (Dimethoate) @ 2.0 ml/L; T5: Allion 2.5 EC (Lamda-Cyhalothrin) @; T6: Admire 200SL (Imidachorpid) @ 0.25 ml/Land T7: Control. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The lowest number of whitefly infestation per plant in the vegetative stage (4.18) and reproductive stage (2.13) was recorded from T6 treatment, whereas the highest (14.44) and (8.10) was recorded from T7 treatment in respective stage. Thrips infestation was higher (6.32) per 5 flower was recorded from T7 treatment whereas lower infestation (1.88) per 10 flower was recorded from T6. The lowest yield per hectare (1.27 ton) was found in T7 and lowest benefit cost ratio (4.16) was found in T5 whereas highest yield per hectare (1.53 ton) was found in T6 and highest benefit cost ratio (12.81) was found in T3 treatment. Among the management practices for controlling whitefly and thrips of mungbean Admire 200SL @ 0.25 ml/L of water was more effective which was followed by Voliam Flexi (Thiamethoxam+Chlorantraniliprole) @ 0.25 ml/L of water Farmers should use Admire 200SL(Imidachorpid) @ 0.25 ml/L of water at 10 days interval for controlling whitefly and thrips in mungbean.