*Present Address: Cotton Section, Department of Genetics and Plant Breeding, CCS Haryana Agricultural University, Hisar, Haryana Email: aniljakhad@gmail.com (corresponding author)
**Department of Plant Breeding and Genetics, Bihar Agricultural University, Sabour (Bhagalpur), Bihar
***Department of Agronomy, Bihar Agricultural University, Sabour (Bhagalpur), Bihar
Department of Entomology, CCS Haryana Agricultural University, Hisar, Haryana
Online published on 24 October, 2019.
A field experiment was conducted to explore the activity of insect herbivores in linseed, their natural enemies, and population dynamics, on variety BRLS-102 at Sabour (Bhagalpur), Bihar during rabi, 2016–17. A total of nine insect herbivores were observed of which the two thrips viz., Thrips palmi and Frankliniella schultzei are new records. Four natural enemies (predators)-Coccinella septempunctata and Menochilus sexmaculata belonging to Coccinellidae, spider (Oxyopes sp.), and Paederus sp (Staphylindiae) were observed. The linseed pests were active from mid-January to mid-March from vegetative to bud formation stage. Maximum population of Agrotis ipsilon and thrips were observed during 52nd and 9th SMW, respectively; and that of aphids, Helicoverpa armigera, Oxyopes sp., coccinellids and bud fly was on the 8th SMW. Correlation coefficients of the population/infestation of these with the weather factors are given herein to explain their population dynamics.
Linseed, pests, predators, Helicoverpa armigera, Agrotis ipsilon, thrips, ladybird beetles, staphylinid, Oxyopes, correlation, weather factors
