Comprehensive control of tip yellowing of garlic leaves in autumn

Planting garlic in autumn is prone to leaf tip yellowing, resulting in short stems and leaves, not thick stems, low yield and poor quality.

I. the cause of the disease

1. The soil fertility was low and the nutrient supply was insufficient in the later stage.

two。 In the later stage, the temperature was too high and the water supply was insufficient.

3. Year after year, the density is too high.

4. It is seriously damaged by leaf spot, anthrax, aphids, red spiders and so on.

II. Prevention and control measures

1. The sandy loam with loose soil and high fertility was selected and 4000 kg of farm manure was applied before planting.

two。 40000 seedlings were planted according to plant spacing of 8 cm, large row spacing of 20 cm and small row spacing of 6 cm.

3. 100 kg of plant ash was sprayed on 667 square meters at seedling stage, which not only prevented the dry and cracked soil and garlic root, but also increased the application of potassium fertilizer.

4. Ploughing and loosening soil in early spring, preserving soil moisture and weeding for 3 times.

5. Grasp the soil moisture during the growing period of garlic seedlings, maintain the maximum field capacity of 60% to 70%, the soil is too dry and wet is easy to produce yellow leaf dry tip phenomenon.

6. In the early stage of garlic seedling growth, regular foliar spraying of Kangkuning, Phytophthora, potassium dihydrogen phosphate and so on to improve stress resistance.

7. Spraying clear water or 150 mg / kg sodium bisulfite in the morning and evening can inhibit plant nutrient consumption, reduce leaf water evaporation, alleviate the harm of dry and hot wind, and delay leaf yellowing and plant premature senescence.

8. Autumn garlic is seriously harmed by leaf spot, anthracnose, aphids and red spiders, causing leaf tip yellowing. It is appropriate to spray the mixture of 1000 foliage and thiophanate every 15 to 20 days, or to spray the leaves to dripping water with the mixture of 25 foliar calcium superphosphate and dry and pure plant ash, or 1500 foliar Lubao and 600xone.