棉花结铃动态与红铃虫防治适期研究  

ON THE DYNAMICS OF COTTON BOLL FORMATION AND OPTIMUM CONTROL TIME OF PINK BOLLWORM

作　　者：刘孝纯[1] 吴孔明[1] 刘芹轩[1] 

机构地区：[1]河南省农业科学院植物保护研究所

出　　处：《植物保护学报》1993年第1期31-35,共5页Journal of Plant Protection

摘　　要：1988—1989年在郑州和太康县对红铃虫蛾量消长和棉花结铃动态进行了研究。结果表明,发蛾动态与敏感青铃期并不完全吻合。一代和二代初期(6—7月份)为蕾花期,敏感青铃很少,且棉株对蕾花脱落有较强的超补偿功能,可不进行防治。8月上旬至9月中旬初为二代盛、末和三代初盛期,平均蛾量虽小人,但正是敏感青铃盛期,应为防治的关键时期。9月中下旬,特别是9月15日以后,蛾量虽居高不下,但大部棉田的敏感青铃率均已降到5%。故一般可以不治,如必须防治,也应把阈值放宽。模拟蛾量和敏感青铃动态多用 Logistie 曲线,作者发现此两种动态曲线受气候影响极大,常呈多波动式曲线,作者选用以生理时间(日度)为自变数的4次多项式模拟,精确度提高了近三倍,其模型为:春棉(?)=1.2467-6.2399x+7.3227x^2-0.8381x^3+0.02636x^4夏棉(?)=6.2935-22.4460x+22.3335x^2-4.1307x^3+0.2393x^4麦棉套(?)=2.6936-1.6746x+1.6804x^2+0.4252x^3-0.In 1988-1989,the dynamics of moth occurrence of pink bollwormPectinophora gossypiella Saunders and boll formation of cotton plant weresystematically in vestigated in Zhengzhou City and Taikang County.The results showed that the peak occurrence of moth is not always co-incident with the susceptible period of green boll.In 1st and early 2ndgenerations,June-July,the control is dispensable owing to that thereare only few susceptible green bolls in cotton field and the cotton plantpossesses over-compensation capability in this time to the damage ofthis insect pest.Whilst in early August-middle September,the peak-late 2nd generation to early-peak 3rd generation of the moth occurrencecoincide with the peak period of susceptible green boll,it should be thekey control time against pink bollworm,in despite of the not so manymoth number occurred.After this period,the susceptible green boll ratesin most of the cotton fields go down to 5%,the control is generallynegligible.Three fourth power polynomial equations were developed as followsto forecast the susceptible green boll period(y_1)with physiological time(x):(?)_1=1.2467-6.2399x+7.3227x^2-0.8381x^3+0.02636x^4(?)_2=6.2935-22.4460x+22.3335x^2-4.1307x^3+0.2393x^4(?)_3=2.6936-1.6746x+1.6804x^2+0.4252x^3-0.05153x^4the estimates are much more accurate than from logistic ones.

关 键 词：红铃虫 棉花 敏感青铃 

分 类 号：S435.622.3[农业科学—农业昆虫与害虫防治]