MANAGEMENT OF ALTERNARIA LEAF SPOT OF CAULIFLOWER THROUGH INNOVATIVE METHODS
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Date
2019-12-13
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COLLEGE OF HORTICULTURE AND FORESTRY, DR Y S P UHF, NERI, HAMIRPUR
Abstract
Alternaria leaf spot of cauliflower occurs worldwide but its prevalent is more in subtropical and temperate areas. The disease causes heavy losses to the crop. In the present investigations, periodic surveys were conducted at various locations in Hamirpur, Mandi, Bilaspur, Kangra, Una, Solan and Kullu districts of Himachal Pradesh and disease incidence from 48 to 85 per cent and disease index from 66 to 69 per cent was recorded. In pathogenicity test, incubation period of 72 h was observed with spray inoculation on 35 days old seedlings. For the management of disease, eight different abiotic resistance inducers were evaluated against the disease under pot conditions and it was found that salicyclic acid (20 mM) was found most effective with 33.67 and 54.46 per cent disease reduction in disease incidence and disease index with plant weight 9.5 kg/plant. Out of five aqueous biopesticides tested under in vitro conditions, Eucalyptus sp. and Azadirachta indica was found most effective at 50 per cent concentration with 82.37 and 79.23 per cent mycelial inhibition, respectively. Among five cow-urine based biopesticides evaluated under in vitro conditions, mycelia growth was not observed in cow-urine alone and cow-urine based biopesticide of Azadirachta indica and Eucalyptus sp at 10 and 15 per cent concentration. Under pot conditions, out of all biopesticide, Azadirachta indica was found to be most effective. Eight different fungicide were tested under in vitro conditions and it was found that azoxystrobin 25 %, azoxystrobin 20 % + difenconazole 12.5 %, zineb 68 % + hexaconazole 4 %, metiram 55 % + pyraclostrobin 5 %, difenconazole and hexaconazole were found most effective and significantly superior among all the treatments with complete inhibition. Foliar spray with zineb + hexaconazole, hexaconazole and azoxystrobin + difenconazole was observed to manage the disease effectively under pot condition.
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