Screening of chilli (Capsicum annuum L.) germplasm for resistance to broad mite, Polyphagotarsonemus latus (Banks) under field conditions

Abstract

Chilli (Capsicum annuum L.) is an economically important spice and vegetable crop cultivated extensively in tropical and subtropical regions of the world. However, its productivity is severely constrained by several insect and mite pests, among which the broad mite, Polyphagotarsonemus latus (Banks), is a major pest causing leaf curling, stunted growth, flower drop and substantial yield losses. Developing resistant cultivars offers an eco-friendly and sustainable approach for broad mite management. Therefore, field investigations were conducted during kharif 2023 and 2024 to evaluate sixteen chilli genotypes, including the susceptible check Byadgi Dabbi, for resistance against broad mite infestation. The study aimed to assess genotypic variability and identify resistant sources for future breeding programmes. During 2023, mean mite infestation was 2.96 mites per leaf, ranging from 2.30–4.02 mites per leaf. Higher populations were recorded on Sadabahar, Rasgulla and Byadgi Kaddi, whereas Phule Jyoti and Phule Mukta exhibited lower infestation levels. Mite incidence commenced at 45 days after transplanting (DAT), reached its peak at 120 DAT and declined thereafter. In 2024, infestation ranged from 1.98–3.78 mites per leaf, with maximum incidence observed at 90 DAT. Sadabahar remained highly susceptible, while Phule Jyoti, RHRCH 8-2 and Phule Mukta consistently recorded lower mite populations. The pooled mean infestation was 2.79 mites per leaf (2.14–3.90). Based on resistance categorisation, 2 genotypes were identified as resistant, 8 as moderately resistant, 3 as moderately susceptible and 3 as susceptible, indicating substantial genetic variability and providing valuable sources for resistance breeding and integrated pest management programmes in chilli.