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为害损失

为害损失

为害损失

为害损失

1

Studies of the Damage Caused by the Main Diseases and Worm of Liaoning Chun Maize

辽宁省春玉米主要病虫为害损失之研究

2

Estimating damages by Laodelphax striatellus and its economic threshold levels at rice spike stage

水稻穗期灰飞虱为害损失测定与防治指标研究

3

Study on the losses of scallion caused by Spodoptera exigua in the west of Sichuan province and its economic threshold

川西地区甜菜夜蛾对大葱的为害损失及防治指标研究

4

Investigation on the Loss Measure by the Seed Pests of Picea crassifolia

青海云杉种实害虫为害损失量调查

5

Preliminary study on the damage caused by Lissorhoptrus oryzophilus and its economical threshold

稻水象甲为害损失及防治指标初步研究

6

Preliminary study on the loss of rice sheath blight of early rice and the economic threshold

早稻纹枯病为害损失估计及防治指标的研究初探

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