Jujube nectarines have been fully sold in various counties, and often at this time, several problems are most likely to occur, and the alliance households that need to plant jujube nectarine varieties pay special attention. Because the jujube nectarine variety is an alternative peach variety, the following problems are prone to occur during the sales and picking period.
1. It is very sensitive to all kinds of foliar fertilizer when entering the comprehensive coloring and sugar increase, such as spraying fertilizer at this time, it is easy to cause the fruit surface to fade or become numb face, so that the appearance quality is greatly affected, and the loss is huge. Therefore, entering the period of rapid expansion, it is forbidden to use all foliar fertilizers, but the fruit surface is beautiful and beautiful. Of course, the coloring and ripening period of the upper, middle and lower fruits is different, according to the degree of coloring, the lower part of the immature part can also be used foliar fertilizer, in order to be safe, you can increase the water multiple. For example, a peach farmer in Weinan expanded the use of 400~500 times potassium dihydrogen phosphate to 2000 times, and the effect of increasing sugar and color in a small amount many times was good. Other foliar fertilizers can be used after a successful small-area trial, and it is best not to use them if you have no experience.
2. Try to avoid pesticides in hot weather to control pests and diseases.
Seven days after the fruit enters the rapid expansion, it grows a circle a day, which is the thinnest stage of the fruit epidermal cells, and the high temperature is the most intolerant and fertilizer stimulation time period, which is easy to cause pesticides and fertilizers to destroy the synthesis of anthoglycosides through the cell membrane and fade, and the price is halved and the loss is huge. It is recommended that when the temperature is lower than 30 degrees, it is good to spray pesticides to control pests and diseases. Generally, the temperature is below 30 degrees for a few hours in the morning. We must break the traditional pesticide control pest control thinking concept, 4 o'clock in the afternoon or evening to carry out plant protection work, you will find that after midnight sometimes the temperature is still above 30 degrees, and the so-called pesticide multiple is reasonable, but also very easy to cause the nectarine fruit surface to become numb and numb face without luster.
3. Peach trees must always reach the basic ventilation and light transmission conditions during the growth period, which is conducive to the increase of effective leaves, the maximization of photosynthetic efficiency, the increase of sugar and coloring, the absorption and synthesis of calcium, and the surface light of the fruit surface. Some peach farmers do not follow the rules to engage in summer pruning (six under seven upper) as a result of the whole garden shade or part of the shade of the tree during the ripening period is difficult to color, in the high temperature and high humidity environment of the sun, under the continuous evaporation of groundwater, the salt will continue to be brought to the air, because the shade peach tree can not reach the ventilation and light transmission conditions, it will continue to evaporate the salt volatilized on the fruit and branches and accumulate and become white attachments, it can be wiped off by hand, washed off with water, it is not a disease but salt, and it is a light salty taste to taste with the tongue. This year, under the conditions of high temperature, high humidity, hot and windless, it is more suitable for white attachments to occur on the fruit surface. When the heat wave gas cannot be emitted and the accumulated temperature exceeds 45 degrees, the spraying will also cause the bottom of the lower fruit to be steamed and rotted like brown rot, which is the pesticide damage caused by high-temperature spraying and steaming. Therefore, in order to reduce your losses, you must remove the main umbrella branches and shading branches in time, so as to facilitate the volatilization of the liquid medicine and reduce the occurrence of this disease. When spraying in hot weather, the concentration of the drug can also be reduced a little or the type and dosage can be reduced, which is more secure. Grasp the main pests and diseases, you can use 2 kinds instead of 3 kinds of pesticides, not the more types, the better, but harmful and easy to accelerate the aging of leaves and fall off early.
Fourth, how to solve the problem of red and green.
Jujube nectarines and other light peach varieties should be properly shaded during the expansion and coloring period, and the effect should be good, and the fruit surface should be delicate and shiny. It is difficult for the lower fruit to turn color, so it is necessary to pick a batch of upper fruits, and immediately carry out a rapid pruning, which can be appropriately heavier, that is, the shading branches can be shortened and cut back, including the strong and thick branches that have borne fruit. The middle and lower parts of the big head will reach the ventilation and light transmission conditions, and the fruit can be quickly colored and sugared in 4~5 days.
Fifth, the idea of pest control can not be relaxed.
Showers in July continue to favor the occurrence and spread of diseases, pay close attention to the price changes of jujube nectarine, when the price is too low than you expected, it is recommended that you consider storage to increase income. Practice has proved that as long as the jujube nectarine farmers and fruit merchants have been stored for more than ten years, they have made money, and even earned several times the money. However, two days before picking, the fungicide difenoconazole must be injected to prevent brown rot infection in the reservoir and cause disease.
Other pests such as thrips, pears, and cattle cannot be relaxed.
Author: Wang Wankui, lecturer of Zhongnong Le Fruit Science Research Institute
Source: Zhongnongle