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- W2368785340 abstract "Recent years in Hetian district shell insects become one type of most harmful insects for fruit tree. Parthenolecanium corni (Bouche), Eulecanium gigantea (shinji), Quadraspidotous perniciosus (Comst)is main occurs in Moyu county. Parthenolecanium corni (Bouche), Eulecanium gigantea (shinjin))produce in a year one generation two or three year old nymph life through winter in tree twig or tree bark clearage。 Quadraspidiotus perniciosus( Comst)produce in a year two of three generation one or two year old nymph life through winter in tree stem.Shell insects most harmful period first time from tree fluid moves time till matured.insects ovulation,this period is optimal to chemical prevention optimal time from and if march to early April.Second time from ovulation till dormancy optimal time for chemical prevention is from fifth of June till twenty-fifth of June.For prevention of shell insects danger we must be use general prevention methods to decrease insecticide usint times." @default.
- W2368785340 created "2016-06-24" @default.
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- W2368785340 date "2004-01-01" @default.
- W2368785340 modified "2023-09-25" @default.
- W2368785340 title "Research on Fruit Tree Shell Insect's Occur Frequency and It's Prevention Countermeasure in Moyu County" @default.
- W2368785340 hasPublicationYear "2004" @default.
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