. Figure 26.—Pea seeds affected by bacterial blight. Note watersoaked areas. Ascochyta Blight Ascochyta pisi, A. pinodella, and Mycosphaerella pinocles Ascochyta blight is caused by one or more of the fungi named above. This disease is widespread and, occasionally, has been a serious threat to the seed and green-pea industries in areas of abundant moisture. Appearance—Somewhat similar though distinguishable, symptoms are caused by the three parasites. The leaf spots caused by M. pinodes are purplish with indefinite margins. Fusion of the spots results in irregular brownish-purple blotches. The
. Figure 26.—Pea seeds affected by bacterial blight. Note watersoaked areas. Ascochyta Blight Ascochyta pisi, A. pinodella, and Mycosphaerella pinocles Ascochyta blight is caused by one or more of the fungi named above. This disease is widespread and, occasionally, has been a serious threat to the seed and green-pea industries in areas of abundant moisture. Appearance—Somewhat similar though distinguishable, symptoms are caused by the three parasites. The leaf spots caused by M. pinodes are purplish with indefinite margins. Fusion of the spots results in irregular brownish-purple blotches. The blotches on the stems are elongated at first; later, fusion of the blotches gives the entire lower stem a bluish cast. When small, pin-point infections appear on the flower parts, blossom drop commonly follows. The symptoms caused by A. pinodella on the plant are * 84
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