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梨黑星病侵染初期可根据天气预测。在3月中旬梨花芽膨大后,日均温达10℃以上,只要出现大于5毫米的降雨。并有连阴天即可出现初浸染,发出首次喷药预报。上年发病严重的梨园,自4月下旬开始调查10株树,每次调查叶、果、梢各500个,隔5～7天调查一次。当病株率达20%,每株有病梢3～5个时立即喷药。防治对策:①开花后期至幼果期,喷50%多菌灵700倍或1:3:240倍波尔多液。②果实膨大期,单喷1:3:200倍波尔多液。③采收前,喷50%多菌灵700倍液混配5%功夫菊酯2000倍液,兼治黄粉
Pear scab infection in early weather can be predicted. Pear in mid-March after the blooming bud, the average daily temperature of 10 ℃ or more, as long as the emergence of more than 5 mm of rainfall. And even cloudy days there may be the first dip, issued the first spray forecast. Pear orchards of the previous year were severely ill. Ten trees were surveyed since late April. Each leaf, fruit and shoot was surveyed 500 times in every 5 to 7 days. When the diseased plants rate of 20%, 3 to 5 per plant shoots immediately spraying. Control measures: ① Flowering late to young fruit, spraying 50% carbendazim 700 times or 1: 3: 240 times Bordeaux mixture. ② fruit swollen period, single spray 1: 3: 200 times Bordeaux mixture. ③ before harvesting, spray 50% Carbendazim 700 times mixed with 5% krypton 2000 times solution, and cure yellow powder