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云南省柑桔面积约14万亩,主要种植于山坡地,分布零散,耕作管理粗放,草害十分严重,为此作者对综合防治技术进行了探讨。 1.柑桔园草害发生情况 按杂草生育期,分3种类型,形成3个草害高峰: 1.1 早春发生型 2—3月萌发出苗,4—5月达发生高峰,5、6月开花结籽后死亡。以阔叶草为主,灌溉条件好或早春有雨水则危害重。 1.2 夏秋发生型 在降透雨后开始萌发,7—8月达又一次发生高峰,8—月开花结实后死亡,以禾草类为主,阔叶草类零星分布。 1.3 晚秋发生型
Yunnan citrus area of about 14 acres, mainly grown in hillsides, scattered, extensive management of tillage, grass is very serious, for which the author of integrated control technology were discussed. Citrus Orchard grass damage occurred according to weed growth period, divided into three types, the formation of three grass peak: 1.1 early spring germination from February to March germination, peaked from April to May, May and June Died after flowering and seed. The broad-leaved grass-based, good irrigation conditions or rain in early spring are endangered. 1.2 The summer and autumn occurrence patterns began to germinate after raining, reached a peak again in July-August, and died after flowering and fruiting in August. The grasses were the dominant species and the broadleaf grasses were sporadically distributed. 1.3 late autumn occurrence type