大豆銹病藥劑防治試驗

Soybean rust caused by Phakopsora Pachyrhizi SYDOW is one of the destructive disease found throughout the growing areas. A spraying experiment for the disease control was conducted at Hwa Lien Experiment Station from 1959 to 1960 including three crops of soybean i.e. fall, spring and summer. The purpose of the experiment is to determine the possible control with fungicides and their effectiveness as well as the timing of spray. The fungicides used for this experiment were Dithane M-22, Dithane Z-78, Dithane Z-78 plus Wettable sulfur, 0-3818-B and Bordeaux mixture which were applied at 7 days interval. A total of 5 applications of each testing fungicides were taken during the growing period. The first application varied differently wih the number of days after planting; they were the 28th, 35th, 42th, and 49th respectively. Evidences indicated that the disease was well checked by either one of the fungidide which has been tested. The profitable time of the first spraying to control rust disease depended upon different crop of soybean. For protection of the spring crop, the first spraying should be initiated at the 35th day, but it is advisable to initiate the spraying program at the 49th day for both summer and fall crops. Yields of the crop were prominently increased except the fall crop which was insignificant because the weather was the limitting factor upon yields. Among the testing fungicides, Dithane M-22 showed best effect to control rust disease while Dithane Z-78, Dithane Z-78 plus Wettable sulfur, Bordeaux mixture came next in order. 0-3818-B a new fungicide produced by Rohm & Haas Co., at the rate of 200 grams per 100 liters has its advantage of rust control, but it produced chemical injuries to the leaves after application. The phytotoxicity tended more serious as the rate of the chemical increased. For the best control soybean rust, it is suggested to apply either Dithane M-22 or Dithane Z-78 at the rate of 300 grams per 100 liters of water.

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大豆銹病藥劑防治試驗

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