Management measures of Walnut trees in Summer

Flower and fruit protection: remove the exuberant female flowers and then carry out artificial pollination. Fertilization: in the peak growth period of female flowers, gibberellin, boron fertilizer and urea can be sprayed every 15 days. Pull branch: pull the cocked branch into place. Pest control: rot disease can be coated with carbendazim wettable powder, black spot can be sprayed with Bordeaux liquid, red spider can spray refined Kemiqing and so on.

First, walnut trees protect flowers and fruits

1. Flower thinning and fruit thinning: in summer, the vigorous female flowers should be thinned from inside to outside, from dense to sparse, and from bottom to top according to the combination of variety, tree potential, tree age and soil conditions.

2. Artificial pollination: artificial pollination can be carried out for the first time when 10% of the female flowers are in full bloom, and the second time when the female flowers are in full bloom, artificial pollination can be carried out.

II. Fertilization for walnut trees

1. Topdressing: for walnut trees that have set fruit, 150g compound fertilizer and 250g urea can be applied after flowering. The compound fertilizer should be selected with high phosphorus content. For newly planted and trial walnut trees, 50g compound fertilizer plus 100g urea can be applied when the new shoot grows to 15cm.

2. Foliar fertilizer spraying: during the peak growth period of female flowers, spraying gibberellin and boron fertilizer can increase the fruit setting rate, and 0.3% Mel 0.5% urea can be sprayed every half a month, which is helpful to promote shoot shooting strength and leaf greening and thickening. Topdressing and foliar spraying can generally be carried out at the same time or alternately.

Third, pull branches of walnut trees

Walnut trees need to pull branches for a long time, generally, the branches that are not pulled in spring or not in place will continue to be pulled in place, and if the branches are extended and warped up, they need to pull down the warped place in time, cut short in spring, or when the new branches grow to 1 meter, pull branches in time.

IV. Control of diseases and insect pests in walnut trees

The main results are as follows: 1. The common diseases of walnut trees are rot and black spot, etc. During this period, it is necessary to strengthen the management of walnut orchard, properly apply organic fertilizer, prune reasonably, white the tree trunk, scrape the disease spot in time in summer and growing season, and apply 1000 times solution of carbendazim wettable powder after scraping, or 20-30 times solution of 40% crystal stone sulfur mixture and 5-10 pommetil sulfur mixture for control.

2. Black spot mainly harms leaves, branches and fruits. Generally, Bordeaux solution with 1-3 times 1-3 times as much as 0.5-200 Bordeaux solution, or 500-800-fold solution of carbendazim wettable powder and 50% methyl topiramate can be sprayed during the growing period.

3. The common pest in summer is the red spider, which generally harms the leaves and then absorbs nutrients from the tree. The high incidence period is from mid to late August to September, which can lead to shedding of leaves, dry leaves, an increase in shrunken shells, and a decrease in yield by about 50%. Therefore, it is necessary to control in time, in order to reduce the population density and control the high incidence period from August to September. Generally, it can be sprayed and killed with pesticides such as refined Kemiqing, avermectin, paraben, and so on.

5. Walnut trees harvest fruit

The main results are as follows: 1. In September, the pericarp can be harvested when there is a crack in the peel, and the bamboo pole can be used to strike from the inside to the outside to prevent sprouts. Walnuts without peeling after harvest can be stacked indoors or outdoors into 40-50cm high, covered with 10cm thick leaves or wheat bran, and wait 3 days before peeling.

2. After peeling, the walnut needs to be washed with clean water, and then put on the bamboo foil to dry, and then dry, during which it should be turned in time, generally waiting for 3-5 days to dry, the sound of the sun-dried walnut is relatively crisp when it hits, and the internal seed coat is also easy to peel off.