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Fruit trees bagging after pest control do not relax
Fruit bagging is an effective measure to prevent diseases and pests of fruit trees. In particular, fruit pests such as rotten fruit, anthracnose, cockroach, and fruit-feeding pests can be controlled. This year, the price of fruit bags has undergone severe fluctuations, basically completing fruit bagging. However, the uneven quality of fruit bags, and the tight time caused by rain, the tightness of seals, the quality of pesticides and the quality of spray, will all cause serious hidden dangers for the occurrence of fruit diseases and insect pests. If the air permeability of the bag is poor, the occurrence of black spot disease will occur; if the seal is not strict, the fruit will invade the bag and the fruits will be damaged, and the rain will infiltrate into fruit rust. After the rain, the therapeutic bactericide will not cause the ring rotten fruit disease to occur. After fruit bagging, the growth management of fruit trees only completed part of the task. It is by no means a matter of peace of mind. As everyone knows, the diseases and pests of the leaves and branches of fruit trees will enter the period of endangerment. The actual situation in recent years shows that if the fruit is bagged, if it is not timely carried out such as summer shear, cultivator, etc., growth management and control of leaf and branch diseases and pests, the occurrence of spotted defoliation disease, brown spot disease, and gold-grained fine moth may occur. In late July, the fruit trees began to defoliate, and even appeared secondary flowering. The occurrence of rough skin disease and dry rot infested 3-4-year-old branches affected the yield, quality, and tree vigor of fruit trees. According to the long-term forecast of the meteorological department, the summer and autumn of this year are still rainy years, and the field is hot and humid, combined with the serious defoliation last year and the abundant bacteria source. It is expected that the occurrence of spotted deciduous disease, brown spot disease, gold-grained moth, rough skin disease, dry rot and rot disease all have a tendency to occur. In response to the state of fruit tree production and management in our city, the following measures are specifically proposed: 1. To strengthen summer management. Summer management is an indispensable and important part of fruit tree production management. Can take pruning, short cut, twist tip, pull branches and other measures to change the orchard's ventilation and light conditions, ease the growth potential of branches. And can significantly inhibit the occurrence of disease and insect pests such as spotted deciduous disease, brown spot disease, and gold leaf moth. For the poorly transformed trees in Shaan County and Lingbao orchards, the intensity of pruning should be increased. To curb the occurrence of early defoliation. Second, timely cultivating grass. Wetter rain will cause weeds to thrive, soil compaction, affecting root growth and fruit enlargement. The ploughing should be done in time to loosen the soil, reduce the pests and diseases, and resist the pests and diseases. Can be used per acre 150-200 ml paraquat water 30-40 kg or 1000-1500 ml 10% glyphosate water spray 20-30 kg. Third, timely leaf nutrition. After fruit bagging, rapid expansion under high temperature and high humidity conditions. Supplementary nutrition is very necessary. In particular, an orchard with poor management and debilitating vigor can be sprayed with Kangda Zhuang Rare Earth Probiotics 600-800 times or Mosuo Multidimensional Protein 800 times, or 0.3% Potassium Dihydrogen Phosphate + 0.1% urea. IV. Prevention and control of pests and diseases 1. Brown spot disease: mainly damages the leaves and causes early defoliation of fruit trees. In May, pathogens spread through wind and rain, and initially invaded the lower leaves of trees. In June, lesions can be seen at the bottom of the leaves. Infestation, diseased leaves increased sharply from July to September. Over-constrained orchards can have a large number of fallen leaves in the middle or late July. Severe orchard occurrences of secondary flowering occur from August to September. Precipitation in many orchards is the main condition for the disease. Fuji, Red Star, Golden Delicious and other species are susceptible to infection. Prevention and control measures: (1) Strengthening summer pruning and improving ventilation and light transmission conditions are the fundamental measures for controlling brown spot. Topdressing phosphorus, potash fertilizers or spraying rare earth ectophytin or rubidium multidimensional protein, potassium dihydrogen phosphate, etc. to enhance tree nutrients and improve resistance to disease. (2) Strengthen prevention and control measures. From mid-June, prevention and control measures will be implemented. In late June, once every 15 days, the drug can be sprayed with 50% of Phytophthora radix (Jiangsu Shennong), 50% acetaminophen, 25% of plaque net (sclerotium net + manganese zinc), 80% 402 antibiotics ( Nanyang) 25% of the total fruit (tebuconazole + manganese zinc) 70% aceto manganese, etc., can also be used 70% of manganese, 70% of the product run dry suspension agent, 42% spray grams of suspension agent used interchangeably. Bordeaux liquid has good control effect on brown spot, and it should be sprayed twice in late August and August. It can also use dry copper, donning, multi-effect, etc. If it is rainy, it is better to use 1:3:200 Bordeaux mixture or 1:1:3:200 zinc copper Bordeaux mixture. 2. A kind of gold leaf moth, apple leaf miner. Larvae sneak into the leaves for feeding. If there are eight to ten spots on a single leaf, the leaves turn yellow and fall off prematurely. From mid-June to mid-September, it was the peak of 3-6 generations of damage, the insects were mixed, and the number of insect populations increased rapidly, which intensified the damage. Control measures: Suspension attractants, trapping and killing adults: May be sprayed with 5% diflubenzuron IV, 25% diflubenzuron III 2000-2500 times or 2.5% kung fu, 35% salamander, 25% clomizuron and so on. 3. The occurrence of the peak of two-spotted spider mites (commonly known as white spiders) is from early August to early September. This leafhopper has high fertility and high drug resistance, and the general acaricide is difficult to control. Preventive measures: 6-7 months more damage on the weeds in orchards, weeds to prevent weeds in time to reduce the base number of insects; chemical control, should choose avermectin preparations. Available 1.8% Insects Buster (Hebei Weiyuan) 6000-8000 times or Qishaosu, 10.2% Manyuanqing 2,500 times, 300 Luene (Kesheng Group) 3000 times.