Non-pesticide Control of Pea Powdery Mildew
Date Issued
2009
Date
2009
Author(s)
Chiu, Hsiao-Chiu
Abstract
The pea prefers the cool and dry climate, and is a high value crop in winter season in Taiwan. The powdery mildew caused by Erysiphe pisi, usually occurs in the period from autumn to spring. The disease can affect all parts of plants during the flowering stages, causing significant yield loss. The powdery mildew is mainly uncontrolled by chemical pesticides, but the pesticides residues are a big issue in food safety. The goal of this research, therefore, is to test the non-pesticide control methods, to reduce the use of chemical pesticides. The test materials include bicarbonate, milk, wintergreen oil, neem oil, and narrow range oil . both pot tests and field trials are conducted. The results showed that in the spore germination test, treatments of oil, sodium bicarbonate, or milk can suppress the spore germination. In pot test plant tests, two kinds of bicarbonate salts show high control rate against the powdery mildew, especially when Tween 20, soap berry, or 0.2%Agar are added to them. Between them, sodium bicarbonate performed better than the potassium bicarbonate. Sodium bicarbonate added with 0.2%Agar (500X) showed the best performance with the 75.5% control rate, and without any phytotoxicity. In this study we found that Erysiphe pisi is resistant to the 10.5% penconazole, which is recommended by Taiwan plant protection authority. The 50% milk amended with 10% sodium bicarbonate, 0.1% Tween 20 and 0.2% Agar, showed good control efficacy. The treated leaves became greener, despite the occurrence of phytotoxicity lesions. Results also showed that wintergreen oil, narrow range oil and neem oil with 0.2% sodium bicarbonate may simultaneously control the powdery mildew, pea aphids (Acyrthosiphon pisum) and two-spot green leafhopper (Amrasca biguttula) in the field. These results suggested the wintergreen oil, narrow range oil and neem oil to reduce the use of synthetic pesticides.
Subjects
powdery mildew
wintergreen oil
bicarbonate salts
SDGs
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