大豆田银纹夜蛾系统控制研究

１９９３￣１９９６年以系统控制为基本技术原理，研究了豆田１１种可控因素对大豆银纹夜蛾，天敌和产量的综合效应，结果表明，对银纹夜蛾影响大的因素是种植方式，微肥，播期和钾素；对天敌影响最大的是种植方式；对大豆产量影响大的是种植方式；播期，品种和微肥。

STUDY ON SYSTEM CONTROL OF THREESPOTTED PLUSIA IN SUMMER FIELD

Under the guidance of system control, the integrative effect of 11 controllable factors of soybean yield on threespotted plusia ( Argyrogramma agnata Staudinger ), natural enemies and summer soybean yield was studied from 1993 to 1996.The results showed that the main factors affecting threespotted plusia were planting mode, trace fertilizer, sowing time and potassium fertilizer application. The most important factor affecting the natural enemies was the planting mode. The main factors affecting the soybean yield were planting mode, sowing time, cultivar and trace fertilizer application. The 11 controllable factors were evaluated synthetically and the optimum system control of threespotted plusia was suggested as follows:1) soybean interplanted in maize field, in the same seed holes or in different rows,2) cultivar Ludou 4 a resistant soybean variety, 3) sowing time on about 10 June,4) dressing seeds with trace element fertilizer at 1800g/hm 2,5) application of fertilizer with dosage of N, P 2O 5 and K 2O at 45kg/hm 2, 60kg/hm 2 and 150kg/hm 2, and dosage of solid manure at 22500kg/hm 2, 6) control of threespotted plusia with Bt at 3000g/hm 2.The technologies of optimum system control to threespotted plusia were made up in the three different modes including soybean sown in the same maize hole, soybean interplanted in maize field and monoculture soybean. It was demonstrated that the three techniques worked significantly by good control of threespotted plusia, increase of yield and natural enemies.