INVESTIGATION ON ASSOCIATION OF Fusarium species AND Meloidogyne enterolobii (Yang and Eisenback) IN CAUSING WILT OF GUAVA AND IT’S MANAGEMENT
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Date
2021
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University of Horticultural Sciences, Bagalkot. (College of Horticulture, Bagalkot).
Abstract
Guava (Psidium guavajava L.) is an important fruit crop of subtropical
countries, which is grown in almost all the states of India. It‟s cultivation is affected by
many diseases, among which wilt complex disease caused by Fusarium species and
Meloidogyne enterolobii is the most destructive disease.
In the survey conducted during 2019, among five districts, the average per cent
wilt incidence was recorded maximum in Bagalkote district (16.5%) followed by Kolar
(10.7%), Koppal (10.33) and Dharwad (6.46%) whereas minimum wilt incidence was
observed in Ramanagara (1.16%). The average root and soil nematode population was
recorded maximum in Bagalkote (336 and 195.75) whereas, minimum root and soil
nematode population was recorded in Ramanagara (24.75 and 14.75). The Fusarium
species was isolated, purified and characterized based on cultural characters. The
prevailing root knot nematode species was characterized based on the perineal pattern.
Interaction between fungi and nematode on guava seedlings were studied under
pot condition, which revealed that inoculation of Meloidogyne enterolobii two weeks
prior to inoculation of Fusarium species showed early wilting symptoms and adversely
affected the plant growth parameters. In vitro studies recorded that tebuconazole 250EC
at 0.025%, COC 50%WP at 0.1% and (Mancozeb63%+Carbendazim75%) WP at 0.3%
were found effective and among the bio agents Trichoderma harzianum and T.
asperellum were found effective against Fusarium species. Under field condition, the
combined application of Trichoderma harzianum (100g/plant) + Neem cake
(250g/plant) + Nimitz (40g/plant) + Mancozeb 63%+ Carbendazim 12% (0.2%) +
Paecilomyces lilacinus (25g/plant) were found effective in managing the wilt complex
disease of guava, which recorded the least per cent wilt incidence of 4.33 with high fruit
yield (15 kg) and B:C ratio (2.16).