What kind of fertilizer should I use to plant apple trees? When will it blossom? What are the key points of post-anthesis pest control techniques? Flowers

Apple trees generally refer to apples, are deciduous trees, usually trees can be up to 15 meters high, but cultivated trees are generally only 3-5 meters high. It usually has a life span of 15-50 years. What kind of fertilizer is good for that kind of good apple tree? When will it blossom? What are the key points of post-anthesis pest control techniques? What kind of medicine should be used in flowering period? According to the data of Rosaceae, the flowering period of apple trees is based on the local climate, but it is generally concentrated in April-May. Apple is a cross-pollinated plant, most varieties of self-pollination can not bear fruit.

What kind of fertilizer should I use to plant apple trees?

1. The base fertilizer for apple trees is mainly based on organic fertilizer, which is the most suitable for autumn. The best time for applying base fertilizer in autumn is after harvest of middle-maturing varieties and before harvest of late-maturing varieties, generally from late September to early October.

2. Base fertilizer should be combined with organic fertilizer and available fertilizer. Organic fertilizers should be mainly slow-acting and semi-late-acting fertilizers, such as pigsty manure, cow and horse manure and human manure and so on. Available fertilizers, mainly nitrogen fertilizers and calcium superphosphate. In order to give full play to the effect of fertilizer, you can first pile several kinds of fertilizer together, and then mix them well. The amount of base fertilizer should account for about 70% of the total amount of fertilizer applied in the whole year according to the effective components, of which the amount of chemical fertilizer should account for 2% of the total amount of fertilizer in the whole year.

What are the key points of prevention and control of diseases and insect pests in apple trees after flowering?

After the apple blossoms, with the spring shoot emergence and exuberant growth, various diseases of apple trees begin to infect, pests begin to sting activities, and gradually enter the period of reproductive damage. According to the investigation of agricultural technicians, many kinds of diseases and insect pests, such as apple powdery mildew, mildew heart disease, golden grain moth, aphid, shell insect, Hawthorn leaf mite, roll leaf moth, beetle beetle, and so on, began to endanger. With the gradual rise of temperature and the increase of rainfall, the infection and reproduction of various diseases and insect pests will be accelerated, and the harm will further increase. All localities should seize the critical opportunity of 7-10 days after anthesis, select fungicides, insecticides and acaricides, supplemented by supporting trapping techniques, and carry out effective prevention and control, which plays an extremely important role in controlling diseases and insect pests throughout the year.

1. Chemical control:

To control diseases such as leaf spot, brown spot and powdery mildew, full-complex mancozeb, thiophanate-methyl and nitrile were selected; avermectin, imidacloprid, acetamiprid, cyhalothrin, fenvalerate and so on were used to control pests such as yellow aphid and leaf moth; pyridaben and thiazox were used to control leaf mites, and the whole garden was sprayed according to the recommended dosage. The combination of mancozeb + acetamiprid + thiazox or promethazine + imidacloprid + pyridaben is recommended, and nitrilazole can be added in orchards with serious powdery mildew.

When applying pesticide, we must choose sunny day, no wind, meticulous and uniform spray after 4 o'clock in the afternoon; spray strictly according to the recommended dosage and concentration on the pesticide label, standardize the use of medicine, do not mix in disorder, to prevent drug damage; use 3 nozzles to pick high spray to ensure balanced pressure and atomization effect, and prohibit the use of spray gun spray, so as to reduce the loss of liquid, improve the utilization rate of pesticides, and reduce pesticide pollution in orchards.

2. trapping and killing technology:

The main results are as follows: (1) hanging traps trap and kill pests. The hanging lure traps 3 to 5 adults per mu. The method is to add water in a basin of about 15 cm in diameter to 2 prime 3 places, add a small amount of washing powder in the water, and hang the lure 1 cm 2 cm above the surface of the water. Then hang the basin on the outer edge of the fruit tree branch, about 1.5 meters from the ground. When the wire is pierced through the lure, the orifice should be directed downward or sideways. Remove the dead insects in the trap basin in time, and the trap core should be replaced every 20-25 days.

(2) Insecticidal lamps are installed in the orchard to trap and kill beetle beetles, leaf moths and other pests. The distance of the lamp is 100-150m, the chessboard is distributed, the lamp is slightly higher than the fruit tree, and the mouth of the insect basin (bag) is 1-1.5 meters from the ground, which is easy to clean up the induced pests. The effect of large area continuous orchard is better.

What kind of medicine is used in the flowering period of apple trees?

1. It is very important to use medicine at the flower and bud stage of apple trees. First, it can effectively reduce the occurrence base and control cost of diseases and insect pests throughout the year; second, it can prevent the late spring cold in flowering; third, it can supplement nutrition during flowering and promote flowering and fruit setting. However, in this period, the tender leaves have not yet been fully developed, and the drug resistance is poor. When using the drug, we should pay attention to the scientific and reasonable concentration of the solution.

2. Apple trees can be sprayed with insecticidal, germicidal and micro-fertilizer pesticides before flowering, and only trace elements such as growth regulators and boron rare earths can be sprayed during flowering.

Time: 2019-03-18 Click: