Pay attention to cucumber "tip"

In summer and autumn, due to improper fertilization, the occurrence of diseases and insect pests was heavy, and the use of drugs was unscientific, which often led to a large proportion of cucumber tipped melons and reduced commercial quality. The causes and prevention measures are as follows:

1. Unbalanced fertilization and large amount of fertilizer. Through investigation, most of the melon farmers have not applied humic acid, amino acids, biologically active fertilizers, and trace element fertilizers since the fruiting dates, but they have applied more than 40% of their N, P and K fertilizers. Usually, the fertilizer is chased once every five days. The amount of mu is 40 to 50 kg. In the past month, the fertilization amount reached more than 200 kilograms, which was about 4 times the normal amount. Excessive chemical fertilizers resulted in high soil solution concentration, secondary salinization, premature root failure, and difficulty in absorbing nutrients from the soil.

2. The medication is not scientific, and the dosage is large. When investigating farmers' drug use, they learned that they generally used drugs once every 2 or 3 days, coupled with high drug concentration, resulting in phytotoxicity on leaves, showing leaf wrinkles, hard as “iron pieces”, and poor ability to produce nutrients.

3. Severe pests and diseases. According to the census, the diseases and insect pests of cucumbers are severe after entering Futian County. They mainly include powdery mildew, target spot disease, downy mildew, bacterial leaf blight, physiological water filling, tobacco (white) mealybug, and spotted fly. And melons compete for nutrients. In particular, the occurrence of whitefly (white) mealworms is large, and the excrement contaminates the foliage, causing the leaves to lose green and yellow, the color is dull, and the nutrient loss of plants is serious.

Because the root system can not normally absorb nutrients, the leaves can not normally produce nutrients, and the nutrients are also plundered by the pests and diseases, resulting in melon strips occurring due to lack of nutrition.

In response to the three above-mentioned unfavorable factors, Guaran should take the following measures to prevent and treat the disease:

1. On topdressing, master 4 times monthly fertilizer. Two of them are humic acid fertilizer + microbial fertilizer, and 43% Huafu plant growth promoter (humic acid liquid fertilizer) can be used for 400-600 ml/mu and 500 million g/g Bacillus subtilis subtilis 500-1000 g, or China's calcium power is 12 to 16 kilograms per mu and it is flushed with water. Chemical fertilizers were alternately applied twice at intervals, and 40% NPK fertilizer was used for 20-30 kg per mu. In addition, 10% boron-zinc-iron-magnesium fertilizer is applied every 10 days or so for foliar spray, each time 100-150 grams per acre, in order to relieve premature root failure and ensure the balanced supply of nutrients.

2. On the fight against drugs, choose pesticides that are friendly to the plants, have a long duration, and do not contaminate the foliage. For example, 57% of acryloyl-zinc water dispersible granules can be used to prevent downy mildew and epidemic disease. A period of up to 15 days. Try to avoid mixing, reducing the number of medications and dosage.

3. Prevention of white (smoke) mealybugs Consider safety and environmental protection, and choose 50% acetamiprid water dispersible granules or 25% pymetrozine suspension 1000 to 2000 times liquid spray.

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