SPATIAL DISTRIBUTION PATTERN OF OVER-WINTERING EGGS AND FIRST GENERATION OF NYMPHS AND ECOLOGICAL CONTROL OF LYGUS LUCORUM MEYER DÜR IN JUJUBE ORCHARD

The number and spatial distribution pattern of over-wintering eggs of Lygus lucorum Meyer Dür were investigated in jujube orchards under different management level from 2005 to 2007. Results showed that the amount of over-wintering eggs of L. lucorum was large, and the eggs were laid on the residual piles, the top of mother spurs of jujube, and the dead mother spurs in the jujube orchard under careless management.
On the contrary, the amount of over-wintering eggs in the fine management orchard was much smaller, and the eggs were laid on the residual piles or the dead mother spurs on the top of secondary branches.
In mid May, ecological environment directly affected the spatial distribution of the first generation of nymphs.
If there were more weeds such as Amaranthus color, Chenopodium album and hedgerow under the trees, then more eggs were laid on weeds, and only a small amount of eggs were laid on the trees.
On the contrary, when there were few weeds under the trees, the amount of eggs laid by L. lucorum on the trees was larger.
The reasonable retaining of the ground surface covered, planting cover crops, or increasing weed amount could reduce the number of the first generation of nymphs and reduce the hazard rate accordingly.

I International Jujube Symposium

C.Q. Liu, Q.L. Wang, X.J. Feng, P. Zhang, G.C. Xi, Y.N. Wang, W.C. Zhen*

spatial distribution pattern, Lygus lucorum, over-wintering eggs, nymphs, ecological control

https://doi.org/10.17660/ActaHortic.2009.840.60