Recently, due to the rise in temperature, cold in the morning and evening, hot and windy at noon, this article by Jiang Shaolong, a senior agronomist in the old urban and rural areas of Yuanmou County, went deep into the field to check that a small number of large tomatoes in the field have pests and diseases, and now the senior agronomist Jiang teacher will explain how to prevent and manage agricultural operations as follows.
Symptoms] The middle and upper parts of the plant are prone to corked sclerocarp.
Both diseases are caused by boron deficiency. Boron deficiency is generally caused by soil acidification, soil drought, or excessive potassium application, which hinders boron uptake; Under high temperature conditions, the growth of plants is accelerated, because of the poor mobility of boron, so it is not very timely, and there is a local boron deficiency. The corkification of fruit is also related to light, and the cork cork is aggravated under strong light or even cloudy days.
Prevention and control methods] First, boron fertilizer is applied at the bottom. Second, in the face of this bad climate, the foliar spray nutrients and regulating substances in advance to improve the stress resistance, and the foliar spray at the fruiting stage is 01%～0.2% borax solution, 7-10 days at a time. Third, the soil is dry and wet during the fruit period, and there can be no shortage of water.
Tomato cracking: [Symptoms]: In the late stage of fruit development or veraison period, when the growth of the peel is not synchronized with the expansion rate of the pulp tissue, the expansion pressure increases, and the fruit cracking occurs. In particular, fruit cracking can occur when showers or torrential rains cause root physiology and boron absorption and operation are hindered.
Tobacco mosaic virus can overwinter on a variety of plants, and can also overwinter on tomato seeds and diseased residues in the soil. It is mainly transmitted through contact with sap and can be invaded as long as the host has a wound. Cucumber mosaic virus is mainly transmitted by aphids, but can also be infected by rubbing inoculation with sap. In winter, the virus mostly overwinters on the roots and weeds, and in the spring, aphids migrate and spread the virus, causing illness. The occurrence of tomato virus disease is closely related to environmental conditions, and high temperature and dry weather are generally conducive to the occurrence of the disease. In addition, excessive application of nitrogen fertilizer can lead to soft plant tissue growth or poor soil, compaction, stickiness and poor drainage. The types of tomato virus sources often change periodically throughout the year, with a large proportion of tobacco mosaic virus in spring and summer, and cucumber mosaic virus in autumn. Therefore, the prevention and control of the virus should be taken in production.
should be taken in order to obtain more satisfactory results.
Prevention and control methods]: Spray 85 than long (B9) and 01 of 96 copper sulphur, 01 Zinc sulfate can improve heat resistance, enhance crack resistance and anti-burning ability, writer: Jiang Shaolong.