EFFECT OF SOME GROWTH REGULATORS ON FOLIAR AND POST-HARVEST DISEASES OF ONION

Document Type : Original Article

Authors

1 Plant Pathology Research Institute, Agricultural Research Centre, Giza, Egypt.

2 Faculty of Agriculture, Suez-Canal University Ismailia, Egypt

Abstract

Cycocel, ethrel and GA3 were the most effective growth regula‌tors in reducing severity of downy mildew and purple blotch, while Pix was less effective. Growth regulators significantly increased bulbs weight. Ethrel at 240 ug/ml showed highest effect, followed by ethrel at 480, Pix at 75 and GA3 at 125 ug/ml. Cycocel at 800 and Pix at 75 pg/ml were the most effective in reducing infection of onion bulbs,-when artificially inoculated with Botry‌tis aliii and Aspergillus niger,and kept in storage. The same trend was ob‌served for bulbs naturally infected with A. niger. Generally, sprouting was reduced by applying growth regulators. Stored bulbs of onion plants sprayed with Cycocel and Pix contained low‌er sugar contents and vitamin C compared with untreated ones, while T. S. S. and titratable acidity showed the opposite. Total and free phenols increased in stored bulbs, resulting from plants sprayed with Pix at 75 pg/ml, as compared with untreated ones, while free phenols decreased in bulbs of plants sprayed with Cycocel at 800 ug/m1. Phenols contents were higher in bulbs inoculated with B. allii and A. niger and obtained from plants treated with pix and cycocel than un‌treated ones.

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