柿广翅蜡蝉越冬卵在油茶树上的空间分布型及过冷却点OA

Ricania sublimbata is one of the important insect pests on Camellia oleifera.This study investi-gated the damage characteristics of R.sublimbata on C.oleifera,determined the spatial distribution pattern of overwintering eggs on C.oleifera using 10 aggregation indexes,and also their supercooling point.The results showed that the damage rate of the southern half of the tree was(6.43±0.59)％,which was significantly high-er than that of the northern half[(4.30±0.46)％].The overwintering eggs were arranged in double rows of al-ternate vertical strips in the branches of C.oleifera,and the oviposition scars were covered with a layer of white wax filament;the oviposition scar was(15.95±0.96)mm in length and(2.02±0.06)mm in width.The diameter of laying branches was(2.69±0.05)mm,and there were(19.68±0.96)overwintering eggs on each laying branch.The overwintering eggs was(1.12±0.01)mm in length and(0.51±0.01)mm in width.The su-percooling point and freezing point of overwintering eggs were(-11.61±0.18)℃ and(-10.89±0.17)℃,respectively.The spatial distribution patterns of overwintering eggs in the southern half,the northern half and the whole tree were aggregation distribution.The results of this study could provide data references for predic-tion and green control of R.sublimbata.