Do not let fertilizer damage cover disease
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On March 22nd, a Daxie cried on the hotline of the vegetable newspaper in the north saying that her shed loofah had destroyed the fertilizer and asked us to hurry to see it. The reporter immediately rushed to the township of Jitai in Shouguang City, where the vegetable farmer was located. Near the agricultural supermarket in Guangdong Village, we met the big sister. She said that the fertilizer was bought here. We called a farmer to come to her. Home's high temperature arch shed. In the late afternoon, only 3 acres of the loofahs that had been in the flowering stage showed different degrees of wilting, and serious ones must have died. It's no wonder that the big cockroach was so anxious and planted a loofah for several years. The first time he encountered such a situation, it was still good before the flushing. He just started to grow fertilizer and it began to show signs of wilting within 3 days. Last year, a shed was sold to more than 80,000 in June and it seems to be destroyed this year. The big brother said that there were no problems in the loofah leaves. The problem was in the roots. The weather was good in the recent days. The temperature in the shed was also high. It was not a root, nor was it like a disease. It was only fat. harmed. However, agricultural capitalists said that his family sold fertilizers that enjoyed good reputation for years. For this reason, the two sides disputed endlessly. The reporter pulled out several loofahs and looked at it. It was found that the base of the sponge gourd was immersed in water, and the main root was rotted, but some hairy roots still existed. Therefore, it was initially determined that the disease was not a harm because the nutrients were mainly absorbed by the plants. Root, if it is fat, it is the capillary root that is the first to suffer. Combining with the characteristics of the loofah on the shed, it is characterized by wilting at noon, returning to normal sooner or later, repeated times, wilting intensification, root rot, and finally the entire plant is blighted. Therefore, the reporter believes that this is due to Phytophthora root rot. Phytophthora root rot infection of plants, the disease at the base of the stem at the beginning of a long water-like spots brown lesions, lesions gradually expanded, slightly sunken. The above-ground ministers are weak and begin to wilt. The lower leaves of the plants begin to yellow gradually from the tips of the leaves. The latter lesions circumnavigate the stem base or roots one week, causing the ground to wither and the lower leaves yellow, and the upper leaves are still green. Longitudinal section of the stem base or root, the xylem was water-stained dark brown, discolored part does not develop upwards, and finally the root stem rot, not long new roots, so that the whole plant withered. Under high humidity conditions, the diseased part produces white cotton-like flocks of sparse moldy material. Phytophthora root rot is more commonly seen in low temperature after planting, high soil moisture, and long duration, or in case of cloudy days, it cannot release air in a timely manner, resulting in high temperature and high humidity conditions, especially after extensive flooding, which can lead to the occurrence of the disease. popular. Chemical control: At the beginning of the disease, 58% metalaxyl MnZn WP can be used, or 72.2% Proccel water can be used as 600 times, and the root can be irrigated twice or 2-3 times. Times of liquid, or 80% of the US-US water dispersible granules 800 times + 25% propiconazole EC 5000 times, the above formula used alternately, the effect is better. The sooner the treatment of the diseased plant is, the better it is to treat the disease as soon as possible at noon, and sooner or later. The sooner the treatment, the better the effect; the more serious the onset, the later the administration and the worse the treatment.