Retting root cause
Because green is basically open cultivation, in the water, water, water is too large, or the field again after the rain drainage because of not in time, can cause retting root phenomenon, resulting in leaf of nothing.
Preventive measures: when watering right amount, and drainage in time after the rain, don't water in the field, the machine is in a timely manner, at the same time, improve the soil permeability.
disease
onion white disease is the main cause of the leaf of white dry, the disease in the onion will occur during the whole growth and development, more than in the leaf sheath, leaf edge there is not obvious in oil dirty disease spot, expand gradually, after disease spot in central are pale, serious when disease spot extension hang dry, leaf blight.
Preventive measures: but in the early onset of spraying 600 times at rick liquid or net 1500 times liquid, 52.5% fast suppression.
Leaf mites cause
Leaf mites in the air is dry and high temperature environment under the condition of fertility is strong, is the harm of leaf general are point occurs, white dry filtration, growing weak, slow growth.
Preventive measures: spraying 1.8% abamectin 3000 times liquid or 3000 times liquid, 15% of dalai mite spirit.
Spot hidden fly reason
Spot hidden flies can harm a variety of vegetables, green Chinese onion is harmful, the feeding larvae under the leaf epidermis mesophyll, tunnel and curve shape, seriously affect the growth and development, a serious, leaf of nothing.
Preventive measures: spraying 1.8% abamectin 3000 times liquid or fly amine 1500 times liquid, 10%.
Thrips cause
Thrips on the leaf of harm serious, which starts from the heart on the leaves and buds, murder of leaf form many point line and striped yellow-white, serious distortion of leaf withered and yellow, and white dry, when leaf can't eat.
Preventive measures: spraying 10% imidacloprid 2000 times liquid or 2500 times liquid, 5% of the fluorine insect nitrile.
