Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Spatial distribution of cowpea aphid, Aphis craccivora Koch. and its predator Coccinella spp. on alfalfa in cold arid region of Ladakh.

Abstract

An experiment was conducted during 2004 in Ladakh, Jammu and Kashmir, India, to study the spatial distribution of cowpea aphid (Aphis craccivora) and its predator (Coccinella spp.) on lucerne. Observations were recorded at weekly intervals from first aphid appearance (last week of May) until its cessation (July). The aphids followed a negative binomial distribution while its predator followed a positive binomial distribution for all the sampling dates.