STUDIES ON POWDERY MILDEW OF OKRA (Abelmoschus esculentus(L.) Moench)
| dc.contributor.advisor | GUPTA, S.K. | |
| dc.contributor.author | PATHANIA, ABHISHEK | |
| dc.date.accessioned | 2017-05-08T11:12:54Z | |
| dc.date.available | 2017-05-08T11:12:54Z | |
| dc.date.issued | 2014 | |
| dc.description.abstract | ABSTRACT Powdery mildew (Erysiphe cichoracearum DC.) is an important disease of okra in Himachal Pradesh. Present investigations were undertaken with an objective to study the occurrence, symptomatology, correct identity of the pathogen involved, pathogenicity, relationship of environmental factors with disease development, screening of germplasm and to evolve an effective disease management strategy. The disease was found prevalent in moderate to severe form in Solan and Sirmaur districts of Himachal Pradesh. The characteristic symptoms were observed on leaves, petioles and stems while no symptoms were observed on the fruit. On the basis of anamorphic characters like ectophytic mycelium, unbranched conidiophores with cylindrical foot cell, oval to roundish or barrel shaped conidia, size, absence of fibrosin bodies in conidium, simple and straight germ tube and presence of appressoria, the associated pathogen was identified as Erysiphe cichoracearum DC. as the causal agent of the disease in Solan andSirmaur districts of Himachal Pradesh. Pathogenicity test showed that both i.e. cotyledonary and first true leaves were susceptible. Maximum conidial germination and germ tube length was recorded at 25 o C temperature and 70.4 per cent relative humidity. Moderate air temperature of 25 ± 1°C coupled with slightly less relative humidity (<70%) and less cumulative rainfall helped significantly in disease development. Three cvs./lines like Shakti, MH-73, VRO-5 were observed as resistant while fifteen cvs./lines were moderately susceptible. Among all the fungicides evaluated, carbendazim proved most effective at all concentrations followed by dinocap (300 ppm) and wettable sulphur (1000 ppm) and completely checked the conidial germination and germ tube length under in vitro conditions. In field experiments, among different fungicides difenoconazole sprays were significantly most effective followed by hexaconazole in reducing the severity of powdery mildew and increased fruit yield. Among different natural products and botanicals a combination of fermented cow urine + fermented butter milk (10%+10%) was statistically superior and reduced the powdery mildew severity and increased fruit yield. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810010782 | |
| dc.keywords | okra,diseases,Powdery mildew (Erysiphe cichoracearum DC.) | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | UHF,NAUNI | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.subject | null | en_US |
| dc.theme | okra,diseases,Powdery mildew (Erysiphe cichoracearum DC.) | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | STUDIES ON POWDERY MILDEW OF OKRA (Abelmoschus esculentus(L.) Moench) | en_US |
| dc.type | Thesis | en_US |
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