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为得出几种主要菜虫的防治指标 ,测定了春甘蓝京丰 1号不同生育期的绿叶数及全株叶面积和菜青虫、甜菜夜蛾、斜纹夜蛾的食叶面积并进行了田间剪叶试验 .结果表明 :甘蓝莲座期对外叶损失有相当强的补偿力 ,每株有菜青虫 3.5头 (即每 35 7cm2 叶面积有 1头 )时产量比对照约增 10 % ,据此认为每株春甘蓝上的菜青虫或甜菜夜蛾多于或等于 5头时应防治 ,甜菜夜蛾与菜青虫、斜纹夜蛾多于或等于 1.5头时应进行防治 ;菜球充实初期次之 ,每 30 0 cm2 叶面积有菜青虫 1头 (合每株 2 6 .7头 )时比对照约增产 3.6 % ;结球始期对虫害敏感 ,每 315 cm2 叶面积有菜青虫 1头 (合每株 12 .7头 )时减产 4 .1% .心叶及球叶受害对产量的影响表现与外叶受损相似的趋势 ,莲座期剪去心叶面积多达 3/ 4 ,约合 0 .91头菜青虫取食心叶 ,比对照增产 6 .3% ;菜球充实初期各层绿叶剪去 1/ 3面积 ,约合每株 4 .2头菜青虫取食球叶 ,增产 6 .1% ,但剪去 1/ 2即约合 8.4头菜青虫取食球叶则减产 6 .82 % ;结球始期不同剪心叶量均导致减产 ,例如每株剪心叶 1/ 3,约合 0 .73头菜青虫取食心叶 ,减产 2 .4 % .菜球充实初期 ,球叶损伤减产程度虽然不如结球始期剪心叶的严重 ,但成熟菜球外观畸形 ,未达上市标准 ,若加工腌菜则无妨 ;如剥去损伤球叶
In order to obtain the control index of several major cabbage insects, the leaf number of the green leaves and whole plant leaf area and the leaf area of Pieris rapae, Spodoptera exigua, and Spodoptera litura were determined and compared in field The result of leaf cutting test showed that there was a strong compensatory force on the loss of outer leaves in cabbage and rosacea. The yield of 3.5 cabbage caterpillar per plant (ie 1 leaf per 35 7 cm 2) was about 10% higher than that of the control, Each cabbage caterpillar on cabbage or beet armyworm more than or equal to 5 should be prevention and control, beet armyworm and Pieris rapae, Spodoptera litura more than or equal to 1.5 should be carried out prevention and treatment; The number of cabbage caterpillars was increased by 3.6% per leaf area per 30 cm 2 compared with the control (about 26.7 per plant). The initial stage of cotyledon was sensitive to pests. There were 1 cabbage caterpillar per leaf area per 315 cm2 12.7), the yield decreased by 4.1%. The effects of heart and leaf damage on yield were similar to those of the external injury, and the area of the heart leaf was as much as 3/4 in the rosette stage, which was about 0.91 Head cabbage caterpillars feeding heart, yield 6.3% more than the control; vegetable ball full of early green leaves cut 1/3 area, about every Strains 4.2. Pieris rapae feeding on the leaf, yield 6.1%, but cut to 1/2 or about 8.4 cabbage caterpillars fed on the ball 6,82% yield reduction; For example, 1/3 leaves per plant, about 0.73 heads Pieris rapae eating heart, yield 2.4% .Effects of early stage of balloon accumulation, although less than the extent of loss of leaf cotyledons shearing heart Serious leaves, but the mature appearance of malformed vegetables, less than the market standard, if processing pickled it any harm; such as stripping damage leaves