Disease analysis
According to the situation he reflected and the disease samples provided, with reference to relevant technical data, the author determined that this is a typical symptom caused by the brown ear of grapevine. This disease is mainly responsible for the damage of the young cob tissue of the grape ear, and begins to produce water-soaked spots on the branches and cobs of the young ear. After the expansion, it causes browning and necrosis of the cob, and fruit loss, wilting or shedding. When the weather is wet, black moulds are formed on the surface of the diseased part, ie, the conidial stems and conidia of the germs, and they rarely spread to the main cob. The later-dried rachis axis is easily broken and shed by the wind at the branches. The appearance of young fruit granules forms small round, brownish to dark brown spots, with the swelling of the fruit granules and the lesions becoming sore and emaciated.
The pathogenic bacteria were overwintering in the epidermis or bud scales of dendrite with conidial shoots. Germination of young shoots to conidial infestation of spring flowering in the coming spring, and reinfestation by wind and rain. The lack of fertility, imbalance of nitrogen, phosphorus and potassium, low-lying terrain, poor ventilation and light transmission, and the differences in disease resistance among varieties (Kyoho strains are particularly resistant to the disease) are important factors that contribute to the serious occurrence of this disease. In this case, the 100 kg of urea and 50 kg of diammonium phosphate added by the farmer were added together. The ratio of nitrogen, phosphorus, and potassium became 110:47:0, and the demand for grapes for nitrogen, phosphorus, and potassium was increased. The large difference in the amount of approximately 2:1:2, coupled with the fact that the resistance of the Kyoho cultivar to the disease is already very poor, it is not surprising that the disease is so severe.
Responses
In order to better solve the serious diseases caused by blind fertilization, at the author’s suggestion, he first applied spraying and rinsing with 55% Eurasian Americans rich in high-potassium (10:10:35) and various kinds of medium and trace elements. The quick-acting water-soluble fertilizer can relieve the imbalance of nitrogen, phosphorus and potassium. Secondly, in the treatment of pesticide sprays, it adopts (1) “Penghai Yin†brand 50% iprodione suspension agent 1000 times, and (2) “Dingjia "80% of the brand is completely complexed with Senmong Zinc WP 900 times liquid + 21% peracetic acid water 375 times, and has achieved an ideal removal effect.
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