The threshold and effective accumulative temperature for the development of Erythroneura sudra

Erythroneura sudra was a major peach pest.According to the test results,the threshold temperatures were(4.33±0.08) ℃ for the eggs,(4.78±0.32) ℃ for the first instar nymphs,(3.05±0.22) ℃ for the second instar nymphs,(3.78±0.28) ℃ for the third instar nymphs,(5.00±0.31) ℃ for the fourth instar nymphs,(5.00±0.26) ℃ for the fifth instar nymphs,(3.63±0.56) ℃ for the preoviposition period and(8.33±0.05) ℃ for the whole generation.The effective accumulative temperatures were(333.33±3.75) ℃ for the eggs,(108.70±3.54) ℃ for the first instar nymphs.(121.95±2.93) ℃ for the second instar nymphs,(121.95±2.83) ℃ for the third instar nymphs,(108.70±3.83) ℃ for the fourth instar nymphs,(166.67±3.00) ℃ for the fifth instar nymphs,(40.32±4.20) ℃ for the preoviposltion period and(833.33±6.00) ℃ for the whole generation.Based on the investigation of E.sudra annual life history and overwintering habits,it was concluded that the occurrence of E.sudra was 5-6 generations annually in Fu′an City of Fujian Province.