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STUDIES ON LIFE AND FERTILITY TABLES OF Meloidogyne incognita ON DIFFERENT VEGETABLE CROPS

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2017-11
SHARMA, G.C.
UHF,NAUNI
81+III
Meloidogyne incognita, different vegetable crops, life and fertility tables
Meloidogyne incognita, different vegetable crops, life and fertility tables
Ph.D

ABSTRACT The present investigation on “Studies on life and fertility tables of Meloidogyne incognita on different vegetable crops” was carried out during 2015-2016 in the Department of Entomology, Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan. Five different vegetable crops viz. tomato, cucumber, okra, French bean and cauliflower were selected for the studies and were carried out under room and controlled temperature conditions (28.8±2.4°C and 25.0±1°C, respectively). Results revealed that at constant temperature, the total developmental period of the nematode was 30, 32, 26, 32 and 25 days on tomato, cucumber, okra, French bean and cauliflower, respectively, while at room temperature it was 34, 23, 27, 31 and 27 days, respectively. Significant variation in the fecundity of M. incognita was found on five vegetable crops. It was found to be highest on cucumber (869.45 eggs/ female) and minimum on cauliflower (348.69 eggs/ female) at constant temperature, while at room temperature maximum on tomato (902.83 eggs/ female) and minimum on okra (272.55 eggs/ female). Maximum time to complete one generation by the nematode was on tomato (26.35 days), while the minimum time was taken on okra (12.38 days).Under room temperature the maximum generation time was on tomato and minimum on cucumber. At constant temperature, the nematode took 4.85, 2.89, 4.23, 3.24 and 3.59 days to double itself on tomato, cucumber, okra, French bean and cauliflower, respectively, while under room temperature it was 3.19, 2.97, 4.78, 3.30 and 4.36 days respectively. At constant temperature, the true intrinsic rate of increase (rm) and the finite rate of natural increase ( ) were maximum in cucumber and tomato, respectively, while they were minimum in vice versa parameters. However, under room temperature the above two parameters were highest in cucumber (0.23) and okra (1.93), respectively, while minimum in okra (0.145) and cucumber (1.46), respectively.

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