Occurrence and chemical control of the second generation of cotton bollworm(Helicoverpa armigera) in tomato field.
Author of the article:WANG De-Xu，ZHANG Wei，JIANG Zhen-Xiang，SU Wei-Gong
Author's Workplace：(Plant Protection Station of Laixi, Laixi 266600,China).
Key Words：tomato; cotton bollworm (Helicoverpa armigera); occurrence; chemical control
Abstract：The damage of the second generation cotton bollworm to tomato is much serious in Laixi, Shandong Province. 95% eggs is laid on the tender top, tender calyx and the base of stem. There are 32.8 eggs on average each plant from June 20 to July 5. The relatio