Status of Invasive Species of Thrips, Thrips Parvispinus (Karny) Infesting Chilli and Investigation Studies on IPDM Package in Dharmapuri Districts, Tamil Nadu, India

Abstract

Roving survey results revealed that mean population of thrips, mite population and tospovirus incidence was recorded to be 1.63, 0.68 & 2.05 and 1.88, 0.74 & 1.57 in Pennagaram and Palacode blocks. In the field experiments, mean population in the module I IPDM module was recorded low thrips population (1.05 nos./leaf and 0.64 nos/Sq.m2 leaves) followed by module II IPDM (1.11 Nos./leaf and 0.71nos/Sq.m2 leaves). A virus incidence of 1.0 to 2.0 % was recorded in treatment 2 module II and treatment 3 Farmers practices 2.2 to 9.5 % was observed. The per cent reduction over control of thrips and mite population is highest in T1 followed by T2 and farmer practice (81.70, 80.66 and 56.48 % & 79.61,77.38 and 33.12 %). The percent reduction over control of tospovirus by thrips is highest in T1 IPDM module followed IPDM II than farmer practice (100, 88.88 and 54.40%). The yield of green chilli and BC ratio were found to be high in IPDM module (22.96 t/ha and 3.02) followed by module II IPDM (19.14 t/ha and 2.78) followed by farmer’s practice (13.88 t/ha and 1.49).