In the spring of each year, some provinces in our province will grow cowpeas in early spring in large and small cold sheds. The yield is good, so the scale is formed. However, due to the fluctuating temperature in April this year, the growth period of cowpeas is generally later than in previous years. The more unfavorable result is that there have been more cloudy days and more rains since April, and the rainfall is high and the relative humidity in the field is high, which has caused the epidemic of diseases. According to the survey, because these diseases have not been seen by farmers, it is difficult to take preventive measures, and the condition is still spreading and aggravating. Therefore, the results of field examinations and indoor microscopic examinations were told to the majority of cowpea farmers in order to properly implement prevention and control.
First, the diagnosis
Chenjiayu Village in Zhengding County is a large cowpea planting village. There are two kinds of planting methods: large cold shed and small cold shed. All membranes are removed at present, and they have already been plugged in early. They are 25 to 30 centimeters in height. The old style here has anxiously allowed us to see the conditions that have occurred. After careful investigation of several sites, there are three kinds of conditions. The first is the purple and purple stems, the performance is a piece of purple on the back of the leaves, the stem on the strip of purple spots. There is no obvious mold layer; Second, the lower leaves of the bean pods are yellow, the leaves have 0.8 to 2 cm long polyhedral, semi-circular russet spots, there are obvious ring lines, severe leaves dry off; three is late broadcast The bean pods were yellow and gradually died. Pulled out to check, the roots are still normal, but the base of the stem (the stem below the soil) has a red-brown depression spot, the shape of the heavy can not see the spot, the base of the stem is curled, dark brown, and longitudinal cracks.
Violet and purple stems were examined indoors and there was no infestation of pathogens due to phosphorus deficiency. The second russet was a kind of myxomycetes caused by the infection of the cercaria fungus. The disease at the base of the stem was established. Blight, also called base rot, is infested by Rhizoctonia solani. One of the surveys had used hymexazol after consulting in advance and the plants turned from yellow to green, indicating that the treatment was symptomatic. On the same day, there was a farmer in the counties who had telephoned and also reflected that the kidney bean stem was broken, and its vascular bundle had brown lesions. Diagnosis is wilt disease.
Second, control methods
1. Due to the occurrence of phosphorus-deficient purple leaves, and purple stems and mycoplasma on the same plant, sterilization and phosphorus supplementation can be carried out simultaneously. It can be used 50% fasting WP 1000 times solution or 10% EGEX (dioxiconazole) water dispersible granule 3000～4000 times solution, mixed with 0.2%～0.3% potassium dihydrogen phosphate+6000 times solution. Once a day, use 2 or 3 times. Spray up and down, and turn over the sprayer, spraying the leaves from the bottom up.
2. Fields with blight or blight disease, with 85% trichloroisocyanuric acid soluble powder 1500 times or 50% chlorobromide isocyanuric acid 600 times, plus amines outside the liquid fertilizing roots, each 150 grams of liquid strains, 7 days apart, and then again. The liquid should be used with it.
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