Population dynamics of insect pests on short duration pigeon pea in relation to weather parameters

Subhash Chander Subhash Chander,Suresh M Nebapure Suresh M Nebapure,D Sagar D Sagar

doi:10.54386/jam.v20i3.551

Subhash Chander Subhash Chander, Suresh M Nebapure Suresh M Nebapure + Show 1 more

Open Access

https://doi.org/10.54386/jam.v20i3.551

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Abstract

Population dynamics of insect pests on short duration pigeon pea was studied in relation with weather parameters during kharif 2016 and 2017. Spotted pod borer, Maruca vitrata (F.) and blister beetle, Mylabris pustulata Thunberg were observed to be major pests in Delhi environment during both the years while, low incidence of other pests viz., gram pod borer, Helicoverpa armigera (Hubner) andpod bug, Clavigralla gibbosa Spinola were also recorded. Spotted pod borer population peaked during 41st standard meteorological week. Blister beetle incidence commenced during 36 th standard meteorological week and peaked during 37th standard meteorological week. Maximum temperature of 1-lag week was found to have non-significant positive correlation with gram pod borer (r= 0.64) and spotted pod borer (r = 0.52) larval population. The built-up of pod bug population had highest significant negative correlation with minimum temperature (r=-0.82) of current week and also with relative humidity (r = -0.93) of current week.

Highlights

Pigeon pea or red gram (Cajanus cajan (L.) Millspaugh) is a most important pulse crop especially in rainfed agriculture
We studied the dynamics of different pests on pigeon pea and its relation to weather parameters at ICARIndian Agricultural Research Institute (IARI), New Delhi during 2016 and 2017
Larvae of spotted pod borer were observed on buds, flowers and pods; larvae of gram pod borer and nymphs and adults of pod bugs on pods whereas blister beetle adults were counted on whole plants and mean population per plant was computed

Summary

Introduction

Pigeon pea or red gram (Cajanus cajan (L.) Millspaugh) is a most important pulse crop especially in rainfed agriculture. Simple correlation co-efficient of pooled pest population with weather parameters viz., maximum temperature (Tmax), minimum temperature (Tmin), morning relative humidity (RH1), evening relative humidity (RH2), rainfall (RF), sunshine hours (SSH) and wind speed (WS) of current, 1-lag and 2-lag weeks were computed. Among different pests spotted pod borer (M. vitrata) and blister beetle (M. pustulata) were major during kharif 2016 and 2017 whereas population of other pests such as gram pod borer (H. armigera) and pod bug (C. gibbosa) remained very low.

Results

Conclusion