Studies on seasonal incidence of aphids in lucerne [Medicago sativa (L.)] andtheir relationship with weather parameters

K.  NISHMITHA; N. S.  KULKARNI; SHEKHARAPPA .; B. G.  SHIVAKUMAR

doi:10.61475/jfm.v34i04.164

K. NISHMITHA Department of Agricultural Entomology, College of Agriculture, Dharwad, University of Agricultural Sciences, Dharwad - 580005 (Karnataka), India
N. S. KULKARNI IGFRI - Sothern Regional Research Station, Dharwad, College of Agriculture, Dharwad, University of Agricultural Sciences, Dharwad - 580005 (Karnataka), India
SHEKHARAPPA . Department of Agricultural Entomology, College of Agriculture, Dharwad, University of Agricultural Sciences, Dharwad - 580005 (Karnataka), India
B. G. SHIVAKUMAR IGFRI - Sothern Regional Research Station, Dharwad, College of Agriculture, Dharwad, University of Agricultural Sciences, Dharwad - 580005 (Karnataka), India

DOI: https://doi.org/10.61475/jfm.v34i04.164

Keywords: Aphid, Caterpillar, Coccinellids, Lucerne

Abstract

Seasonal incidence of aphids on lucerne Medicago sativa (L.) were observed at Indian Grassland and FodderResearch Institute (IGFRI), Southern Regional Research station (SRRS), Dharwad, during rabi 2020-21.The Seasonalincidence of aphids in lucerne and their relationship with weather parameters revealed that, the peak population of peaaphid, Acyrthosiphon pisum was noticed during second week of March 2021. Pea aphid population showed significantlypositive correlation with the maximum temperature (0.426*) and highly significant negative correlation with relativehumidity (-0.54*). Pea aphid population was significantly positively correlated with coccinellids (0.55*). Peak populationof cowpea aphid Aphis craccivora was observed during 4th week of December, 2020. Cowpea aphid population wassignificantly and negatively correlated to maximum temperature and minimum temperatures (-0.48* & -0.41*) and significantpositive correlation was found between aphid population and its natural predator coccinellids (0.49*)