Co-Authors:
Grinstein, A., Department for Pesticide Application Research, Division of Agricultural Engineering, ARO, The Volcani Center, Bet Dagan 50-250, Israel
Frankel, H., Department for Pesticide Application Research, Division of Agricultural Engineering, ARO, The Volcani Center, Bet Dagan 50-250, Israel
Austerweil, M., Department for Pesticide Application Research, Division of Agricultural Engineering, ARO, The Volcani Center, Bet Dagan 50-250, Israel
Kritzman, G., Department of Plant Pathology, ARO, The Volcani Center, Bet Dagan 50-250, Israel
Abstract:
A severe leaf spot disease on the flower stalks of seed onions is caused by a Stemphylium sp. which attacks the seed-stalk, weakening it and finally causing its collapse. The concept of applying a fungicide by a two-directional air-assisted placement spraying technique was investigated in the laboratory and subsequently proven in the field. It was shown that disease control was linear with the fungicide-protected area. Disease severity was reduced by ∼ 75% by the air-assisted placement spraying compared with ∼ 30% for cloud spraying. The results also indicated that the infection area was linearly proportional to the calculated seed yield. © 1988.
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