Studies On The Occurrence And Control Measures Of Lygus Lcorum Mayer In Jujube In Tianjin Region

The distribution, occurrence period, occurrence rhythm and life history of lucorum in jujube orchards were studied in the district of Dagang, Jinghai and Ninghe. The results showed that the lucorum had five generations once a year. in addition, they had obvious metagenesis.The activity of lucorum had obvious correlation with growth period. Overwintering egg of lucorum began to hatch to the first generation larva with jujube bourgeoning. It took about 20-30 days from larva to imago. The first generation imago appeared mainly at the period of the top of jujube fast growth.The first generation imago spawn mainly at the bud of jujube. The second generation of larvae appeared at early flowering stage. eruptive period appeared full-bloom stage and fruit setting stage. The adult emigrated the jujube orchard at the growth stage of fruit(at the late of June and early of July). The third and fourth generation lucorum and fifth generation larva hosted at the other crops, the fifth generation of adult moved back to the jujube and spawned for living through the winter at the end of August and early September. Overwintering egg of lucorum mainly spawned in the point of fracture of jujube shoot, and the rate of oviposition was 29.8%-32.4%. The egg were merely found in the spur of jujube and crack, and rate of oviposition was 2.3%-4.6%.Therefore, Shearing the point of fracture of jujube shoot,we can destroy the eggs to cntrol the quantity of lucorum.Agricultural, physical ,chemical and integrated management had been used to control the lucorum. The results showed that insect-proof net could prevent lucorum effectively, and hatching rate and overwintering egg was decreased by the insect-proof net. Yellow pasting inset board was effective to control the lucorum, blue pasting inset board and pasting inset adhesive presented the poor effect. The sunflower and corn could attract the lucorum combined with the chemical pesticide,which could decrease the quantity of the lucorum transfering the jujube. Chemical control should be used before germination, Chemical control should be used before germination,and chemical reagents including methomyl,cypermethrin imidacloprid and fipronil were highly-efficient to control the lucorum. fipronil was better among them .when it was diluted to 1000 multiple,its control effect was up to 85%,and the effect could sustain up to 7 days. So fipronil, imidacloprid,and methomyl were suggested to use.In addition, alternative use of each reagents should be adopted to avoid the anti-resistance.