Vol. 12, Special Issue 9 (2023)

Author(s):
Savitri, SC Mukherjee, Jayalaxmi Ganguli, RN Ganguli and Rajkumari

Abstract:
Studies were conducted to compare the naturally occurrence of Trichogramma spp. under field conditions in organic and chemically treated rice crops by using sentinel cards and also to find colour preference for egg laying of Trichogramma spp. in organic and chemically treated field areas. The highest population was found in September in organic fields and October in chemically treated fields, i.e., 10.81 and 6.44, respectively, and the lowest mean population was found in August in both organic and chemically treated fields, i.e., 3.78 and 2.33, respectively. Pink was the most preferred colour card in both fields, with pink being seen at 21.25 in the organic field and 10.08 in the chemically treated field. Due to heat absorption, the colour card that was least preferred was black in both rice fields, where parasitization was measured at 0.42 and 0.33, respectively, causing the drying of eggs.