Effect of chitosan and acidified nitrite on control of seed-borne anthracnose in chili pepper
2011
Taengchompoo, D. | Sittisombut, T. | Pagamas, P., Kasetsart Univ., Kamphaeng Saen Campus, Nakhom Pathom 73140 (Thailand). Dept. of Horticulture
Anthracnose caused by Colletotrichum spp., is on of the most important diseases of chili pepper production in Thailand. Anthracnose infects chili pepper at all growth stages and transmits to seed. Conventionallly, fungicides are widely used to control the disease but have adverse effect on the health of farmers and consumers. Acidified nitrite (NaNO2), a food additive, and chitosan have been shown its activity against plant pathogenic fungi. This study sought to determine the efficacy of acidified nitrite and chitosan on control of seed-borne C. Lapsici isolate 158ci in chili pepper (Capsicum annuum L.) cv. 'Bangchang'. The experiment was carried out in a Completely Randomized Design (CRD). Soaking C. capsici isolate 158ci infected seeds in acidified nitrite (NaNO2 in citric acid buffer (pH 2.5) at 0 (control), 100, 200, 250, 300, 350, and 400mM for 30 min) and chitosan solution (in 0.05% acetic acid at 2.5, 5.0, 10.0 and 50.0 mg/ml for 60 min), and then transferred the treated seeds on PDA (potato dextrose agar) for 7 days. Chitosan at all concentrations could not control the seed-borne anthracnose but showed a potential for improvement of seed quality. Nitrite solution at 100 and 200 mM reduced disease incidence by 70 and 90%, respectively without phytotoxicity, and the 250-400 mM nitrite solution completely controlled seed-borne anthracnose but proved to be phytotoxic at seed germination.
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