Differential Aphid Colony Establishment in <i>Dolichos lablab</i> Varieties Correlated with Some Plant Specific Factors That Impact on Aphid Fecundity

Abstract

Aphid establishes colony in the selective plant parts like vine, leaf petiole, leaflet, inflorescence, and tender fruit in Dolichos lablab Linn but not the entire plant. In this study, the aphid colony establishment in vine is focused to understand the differential resistance response between two varieties. At the early stage of aphid infestation, the aphid colony establishment was significantly different between two genotypes (p value = 0.00) and abbreviated as "resistant" variety that supported lower aphid proliferation (mean value = 48.2 ± 2.2) and "susceptible" variety that supported comparatively higher aphid proliferation (mean value = 215.5 ± 16.9). The total aphid number was significantly different between the two varieties, realized at the early infestation stage when both "antixenosis" and "antibiosis" defense mechanisms were working on. Some plant specific factors like vine diameter, wet/ dry weight ratio of vine, phloem sap pressure, the compactness of the vine, wet/dry weight ratio of leaflet, length of leaf petiole, diameter of leaflet vein were identified as modulating factors. The impact of resistant variety on aphid was also investigated for better understanding of aphid defense mechanism.

Field margins and botanical insecticides enhance Lablab purpureus yield by reducing aphid pests and supporting natural enemies

“…Lablab (Lablab purpureus L.) is a versatile multipurpose food legume that could be used as a model crop to test the integration of such strategies on orphan crops, which often lack good phytosanitary support to manage pest insects (Venzon et al, 2020). Lablab green pods and leaves are used as fresh vegetables, dry seeds provide dietary proteins and the crop is also important animal fodder (Maass et al, 2010;Mondal et al, 2017) and can be used as green manure or as a cover crop (Carsky et al, 2001;Cheruiyot et al, 2011;Northup & Rao, 2015). Lablab is a drought-tolerant crop legume (Maass et al, 2010) that is suited to cropping systems affected by increasing temperatures and drying climate and representative of a number of underutilised or orphan crops that may help mitigate the challenges of climate change.…”

Breeding potential of lablab [Lablab purpureus (L.) Sweet]: a review on characterization and bruchid studies towards improved production and utilization in Africa

“…Lablab production has been hampered by biotic factors resulting in low production and consumption. Insects pests such as legume pod borer (Helicoverpa armigera Hubner and Maruca vitrata Fabricius) (Boit et al 2018;Liao et al 2000;Popoola et al 2019;Srinivasan 2014), pod boring caterpillars, stem borer (Satyagopal et al 2014), stink bugs (Coptosoma cribraria Fabricius) (Chawe et al 2019;Forsythe 2019;Grotelüschen 2014;Mondal et al 2017;Njarui et al 2004), parasitic plant such as Anoplocnemis curvipes Fabricius (Watson et al 2018), Podagrica uniforma (Jac. ), Ootheca mutabilis (Sahlb), Nematocerus acerbus (Faust) aphids (Aphis sp.)…”