STUDIES ON CROP ROTATION FOR MANAGEMENT OF Meloidogyne incognita (Kofoid and White) CHITWOOD IN VEGETABLE CROPS UNDER PROTECTED CULTIVATION
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Date
2018-12
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UHF, NAUNI
Abstract
ABSTRACT
The research investigation entitled “Studies on crop rotation for management of Meloidogyne
incognita (Kofoid and White) Chitwood in vegetable crops under protected cultivation” were undertaken
to record the reproduction of M. incognita on ten selected vegetable crops under pot conditions and to study
the possible effect of different cropping modules for three consecutive seasons as a potential suppressants of
the root-knot nematode under polyhouse conditions. In pot experiment, 500 Juveniles were inoculated per pot
and the highest juvenile penetration per root system was recorded in tomato with 40.2 juveniles with per cent
penetration of 8.04. Cauliflower had the least juvenile penetration of only 10.0. Similarly, the highest
reproductive factor was found in tomato (7.36) and cucumber (7.04). Cauliflower had the minimum RF of
1.08. Lettuce, chinese cabbage, spinach, bell pepper and coriander showed RF>1 but <3 and can be listed as
moderate hosts of root-knot nematode. In the polyhouse experiment, tomato and cucumber had the maximum
gall indices of >4, whereas cauliflower, coriander and spinach had gall indices near to 1. The nematode
damage adversely affected the yield of the vegetable crops grown under study. While working on the benefit
cost ratio, Module 7 (tomato-cauliflower-spinach) showed the highest BC ratio of 4.45:1 followed by Module
4 (tomato-cabbage-chinese cabbage). The BC ratio was found least in Module 6 (capsicum-cauliflowercoriander).
Cucumber-cabbage-Chinese cabbage (Module 5) was found to have a maximum suppressing effect
against M. incognita population whereas, tomato-pea (Module 1) and bell pepper-pea (Module 2) cropping
sequences were found to enhance the nematode population. Cabbage, cauliflower in rotation decreased rootknot
nematode population, while tomato, cucumber and pea supported higher nematode multiplication as
compared to moderate hosts like lettuce, spinach, coriander, bell pepper and Chinese cabbage. The crop
rotation of tomato and cucumber with cabbage and cauliflower has been suggested for nematode management
under protected cultivation.
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