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五月份节气是立夏,小满.月平均气温21.8℃,月平均降水量275.4毫米。雨量增加,气温继续上升.除继续防治上述有关病害外,需要开始防治的病害还有:杉苗赤枯病:5月下旬开始发生。应增施磷钾肥,合理使用氮肥;及时中耕、锄草、间苗;发病前喷1%波尔多液保护杉苗,半月一次,共两次;发病后喷50%退菌特可湿性粉剂1 000倍液,10—1 5天一次,共2—3次。柳杉赤枯病:从5月中旬一直延续到10月。喷5%退菌特500—1,000倍液,半月喷一次,每亩用药液50—75公斤,直至9月份;50%
May solar terms is the beginning of summer, Xiao Man. The monthly average temperature of 21.8 ℃, the average monthly precipitation of 275.4 mm. Rainfall increases and temperatures continue to rise Apart from continuing to prevent and control the above-mentioned diseases, there are also diseases that need to be started to prevent and treat: Sugimunia bronchisem: onset in late May. Should be applied phosphorus and potassium fertilizers, the rational use of nitrogen fertilizer; timely cultivation, weeding, thinning; before the onset of 1% Bordeaux mixture to protect fir seedlings, once every two months, a total of two times; Liquid, 10-1 5 days time, a total of 2-3 times. Cryptomeria repens: from mid-May until October. Spray 5% debridement special 500-1,000 times, half a month spray, 50-75 kg per acre solution until September; 50%