Functional response and density dependent feeding interaction of Pseudomallada astur Banks (Neuroptera: Chrysopidae) against Rugose spiraling whitefly, Aleurodicus rugioperculatus Martin (Hemiptera: Aleyrodidae)

Abstract

A study on feeding potential and functional response of the chrysopid predator, Pseudomallda astur Banks to rugose spiraling whitefly (RSW), Aleurodicus rugioperculatus Martin was carried out at Horticultural Research Station, Ambajipeta , Dr YSR Horticultural University, Andhra Pradesh. The study revealed that mean number of RSW eggs consumed increased with advancement of larval instars of P. astur. The maximum number of RSW eggs were consumed by 1st instar at prey density of 80 eggs (94.75 %) and minimum at highest density of 200 eggs (72.25%). The 2nd instar of P. astur also consumed more RSW eggs at a prey density of 100 eggs (96.5 %) and minimum at highest density of 250 eggs (75.52%). The third instar was more voracious and highest consumption was recorded at a prey density of 120 eggs (97.25%) and lowest at 300 eggs (70.27 %). All the larval instars stages followed a Type III functional response. An initial observation on feeding potential of the predator under field conditions was also found to be highly promising. Thus, this predator could be successfully utilised in biological control programs of rugose spiralling whitefly.