桑园小长蝽发生危害规律及防治技术研究

 1998年在云南陆良县首次发现小长蝽［(Nysius ercae(schilling)］危害桑树,有的桑园暴发成灾。经1998～2000年调查研究,小长蝽1年发生1代,以成虫在桑园内外杂草丛中越冬,4月下旬至6月中旬是若虫大量发生时期,此时正值桑树发芽抽条,若虫以刺吸式口器吸食桑芽养份和水份,造成桑芽生长不良,不易展叶,以致枯萎脱落。小长蝽发生危害与气候条件、耕作栽培水平有关清洁田园,冬季提早翻耕桑园,翻耕前喷洒化学农药、深施腐施厩肥,桑芽萌发期(4月上旬)喷药防治等综合措施,能有效的控制其危害。

The Studies on the Preventative Measures Against the Harming of the False Chinch (Nysius ericae) in Malberry Field

The false chinch(Nysius ericae) harm mulberry seriouly in Luliang County of Yunnan Province in 1998. The investigation on the occurrence rule of them shows that they has one generation a year, and passes the winter in weeds at the adult stage. The overwinter adults appears in the middle of or at the end of March in mulberry fields. After feeding and mating, the female oviposit in soil cack and around weed collor. The nymphs appears from the end of April to the middle of June when mulberry sprout,so the buds were hamed seriously. The nymph has five instars. The occurrence and harm of the false chinch relate to the climate and farm technique,if the climate is dry and warm in winter and in spring, and it's weedy in the mulberry fields,and peasant households apply barnyard manure, the false chinch harm mulbery seriously. The following measures may be taken to cotrol the harming of the false chinch1.Weeds the mulberry fields2.Apply the rotted manure3.Plough in advance in winter4.Spray with insecticids in the first ten days of April.(80% DDV or 40% dimethoate emulsion diluted with water to 1∶1 000～1 500)5.Spray with Lime-sulphur (mixture)4°～5°after felling branch.