author(s)
NL Regar, Lekha, H Swami and KC Ahir

abstract
The present investigation on “Biology of Lac insect, Kerria lacca (Kerr) on pigeonpea, Cajanus cajan (L.)” was conducted on Rangeeni strain of lac insect in Baisakhi season at lac insect gene bank cum garden situated at Department of Entomology, Rajasthan College of Agriculture, MPUAT, Udaipur during 2019-20. The study revealed that the mean initial and final density of settlement on lower, middle and upper portion of plant in three set of experiments were 83.70, 80.10, 62.60; 82.90, 79.10, 67.50; 71.50, 72.10, 69.00 and 77.10, 73.40, 56.80; 75.60, 71.30, 59.80; 66.20, 65.70, 62.00 crawlers per sq.cm, respectively. The mean initial mortality and percent settlement of crawlers on lower, middle and upper portion of plant in three set of experiments were 7.89, 8.36, 9.27; 8.81, 9.86, 11.41; 7.41, 8.88, 10.14 and 92.15, 91.48, 90.06; 90.91, 89.98, 88.32; 92.28, 90.78, 89.12 percent, respectively. The duration of sex differentiation on lower, middle and upper portion of plants in three set of experiments were 49.20, 48.80, 48.70; 48.90, 48.80, 47.90 and 49.20, 48.90, 48.10 days, respectively. The mean density of female cells at maturity recorded at lower, middle and upper portion of plant were 4.30, 5.30, 4.40; 4.10, 5.60, 4.00 and 4.40, 4.00, 5.30 female cells per sq.cm in three set of experiment, respectively.