Vol. 7, Issue 7 (2018)

Author(s):
Gupta Rasna, Sharma Gian Chand and Sharma Priyanka

Abstract:
The study was conducted under growth chamber at the Department of Entomology, College of Horticulture, Dr Yashwant Singh Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh during 2015-16 to developed the life fertility table of M. incognita on cauliflower. A life fertility table for Meloidogyne incognita was constructed on cauliflower cv. Pusa Snow K-1 at 25±1ºC. Mortality rates of M. incognita M. incognita life stages were very high during egg and J₂ stages prior to root penetration. Mortality of subsequent life stages was low and virtually constant. The gross reproductive rate was 348.69 eggs/ female, whereas net reproductive rate was 62.65 eggs/ female. The approximate generation time taken by the nematode at constant temperature was 21.61 days. The values for intrinsic capacity for natural increase and true intrinsic rate of increase were 0.19 and 0.16. The initial days of egg laying contributed more to the value of r_m than other age intervals. The nematode took 21.44 days to complete its one generation at respective temperatures. The value for finite rate of natural increase was 1.65 (25±1°C). The time taken by the population to double itself was 3.59 days.