First, the symptoms and hazards Jujube fruit disease, also known as jujube wilting fruit disease, date haze disease, etc., is China's major jujube area one of the major diseases. The jujube fruit with contracting fruit disease first appeared yellow-brown irregularly colored spots on the shoulder or chin of the fruit, and then the skin appeared water-stained, earthy yellow, and the edges were unclear. The later peel turned dark red, contracted, and dull. The flesh wards appear brown spots from the outside to the inside, and the soil yellow is soft. The diseased fruit tastes bitter. The handle becomes brown or dark brown. The entire disease is thin and falls off before maturity. After the pathogen of jujube fruit shrinkage invades the normal fruit, the symptoms of the damaged fruit are usually halo, water stain, coloration, atrophy and shedding. However, this is not exactly the case. In the water-spot period, it fell off; in the middle growth stage, fruit shrinkage occurred, and some of the diseased fruit fell off when it was half-red; while fruit growth occurred late in the fruit growth period, and the diseased fruit entered the harvesting period after the shrinkage period did not fall off. Second, the incidence of law in recent years, studies have shown that fruit shrinkage is caused by bacterial infection. The incidence is directly related to the damage of the jujube skin. In addition to the naturally worn jujube wounds that can be transmitted, the disease is mainly transmitted from wounds caused by sucking mouthparts, such as ticks, leafhoppers, and stink bugs. The onset is also related to the development of date fruit. In North China, it usually occurs when jujube fruit turns white to coloring. From the perspective of climatic conditions, when the temperature is between 26°C and 28°C, once it encounters rainy weather or rainy weather, the disease can easily become an outbreak. The occurrence of fruit shredding occurs more often in spotted pieces. A jujube garden often has several trees with severe onset, and a jujube tree often has severe onset of several shoots. In addition, the disease often occurs simultaneously with anthrax on one jujube fruit or at the same time in the jujube garden, sometimes it is difficult to distinguish. The main difference between the two diseases is that the jujube kernels are not blackened. A fruit that only suffers from fruit shrinkage, the kernel usually does not change color, and once infected with anthrax, its core will turn black. Third, prevention and control technology Strengthen pest control work to prevent the occurrence and harm of sucking and inhalation pests in time, such as the damage of peach borer, scale insects, stink bugs, ticks and leafhoppers. Pre-spray pesticides to control food buds like weevil, leafhoppers, and tinea jasminoides; combined 8 to 9 months later insecticidal, insecticides such as cypermethrin and tetrozole (speed poly) mixed spray, on the jujube Control of fruit disease can reach 95% or more. 2. Strengthen the management of orchard soil, keep the soil moist in the period of changing the color of red dates, prevent or reduce the occurrence of cracks. 3. Before and after the change of jujube fruit red and red to spray "jujube fruit crack control agent" (developed by the Shuozhou Academy of Agricultural and Forestry Sciences) to prevent cracking and reduce the occurrence of cracking fruit. Each 10 ml, direct spray on the water 25 to 30 kilograms of whole trees, once every 7 to 10 days, once every 2 to 3 times. 4. Before and after the change of date of redness of the jujube fruit, spray 50% of the DT fungicide 500 times or 12.5% ​​of the special azole powder 3000 times, spray once every 7 to 10 days, and spray 3 to 4 times. Streptomycin was used as a whole tree spray at 200 international units per milliliter (ie, 10 million units of water per 50 kilograms) or oxytetracycline at 200 international units per milliliter, and caladamycin at 140 units per milliliter. Sprayed once every 7 days for a total of 2 or 3 sprays. Because the aqueous solution of the above-mentioned agent is easy to fail. Especially streptomycin, it is best to use them now. In addition, the disease often occurs simultaneously with anthrax on one date or at the same time in the orchard, and it is necessary to simultaneously control it. (Cangzhou Academy of Agriculture and Forestry Sciences)
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