The cultivation of cantaloupe in the greenhouse often occurs when the stem of the stem is severely affected, and the diseased part will surround the stem with a circle, and then the diseased part will show wilting, and the ulcer will appear in the wounded part. What happens is the cantaloupe blight. Bacterial wilt disease occurs in all areas where cantaloupe is grown. It is an important disease in cantaloupe production. It is necessary to timely carry out pesticide control.
The important symptoms of blight are:
We can also call the cantaloupe blight as a black rot, and the rate of diseased plants will be as high as 30 to 50 percent. The disease mainly goes to the main vines and side vines of Weihai crops. In the early stage of the disease, most of the manifestations of the disease are in the vine section, which is in the form of a pale yellow-green oily plaque. The erythema is often secreted at the site of the disease, and becomes a dark brown block shape after drying. In the late stage of the disease, the lesions appear dry and depressed, and the surface layer is pale and relatively easy to be broken. Many small black spots appear on the surface of these lesions, which is the conidia of the pathogen. According to the Chinese Pesticide Network , it is usually three to four days after the occurrence of the disease, and the lesion will circle around the ring. After one week, conidia will be produced. After 14 days of serious illness, the disease will occur. The strain will die. When the fruit is infected with the disease, it usually appears in the vicinity of the ground. The lesion has a circular shape and is about 1.5 cm to 2 cm in size. It is also in the shape of a grease stain at the beginning. The light brown color is slightly sunken and then becomes pale. Many small black spots grow on the lesions, and at the same time, irregular circular cracks are generated. When the humidity is high, the lesions will appear to grow larger and produce water rot, and the pathogenic hyphae will reach the flesh. The surface of the fruit showed a white velvet hyphae layer, and black granules appeared after a few days. During this period, if you encounter gloomy weather, you can see the black small particles sprayed from the beginning of the filament or the dewdrop pink spore angle.
Now I will introduce you to several techniques for effectively preventing cantaloupe blight:
First, depending on the situation, choose a variety that can be disease-resistant.
Second, adopt high-lying mulch film to cover planting, and do a good job of clearing the ditch to reduce the humidity after rainy days; rationally apply fertilizer, apply enough fully decomposed organic fertilizer, scientifically increase the application of phosphate fertilizer and potash fertilizer, in the middle and late production of cantaloupe Take the right time to topdress and prevent defamation. Pull the third, using chemical pesticides. Pesticide Network Recommendation: Use seed soil nutrition bags to cultivate seedlings and carry them with bags for transplanting, that is, forty-five percent of triadimefon thiram, or forty percent of triadimefon Ling can wet powder plus fat soil.
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