Ventilation and dehumidification, control of disease conditions The fungal diseases of cucumbers that have been soaked are almost all conducive to disease development in high-humidity environments. In particular, under conditions of dew on the back of cucumber leaves, downy mildew can invade the leaves within 2 hours (hours). Therefore, to control the humidity in the shed, timely ventilation and dehumidification, to reduce the time of blade condensation, as soon as possible to improve the temperature inside the shed, reduce the relative humidity in the environment, eliminate the etiological factors is the key to disease prevention. The author once put forward the "night wind" approach. That is, after the night frost, the ventilation openings at the booths are opened at night, and the ventilation openings are closed off in rainy weather. Practice has proved that these methods are effective.
Pharmacological prevention can't be relaxed. From the perspective of scientific cultivation, the self-resistance of plants can be improved; starting from controlling the humidity in the environment, controlling the onset conditions can play a good role, but it can not fundamentally solve the problem of disease. Therefore, the use of drugs to prevent diseases and cure diseases in cucumber cultivation has become an indispensable important content.
In the prevention and control of pharmaceuticals, we must implement the principle of “giving priority to prevention and focusing on preventionâ€. In the early stage of growth, every 10 to 15 days was sprayed with a protective agent; the melon period also entered a period of disease, and every 5 to 7 days was sprayed once to protect the compounded drugs. There are many pharmaceutical agents for the control of downy mildew, such as chlorothalonil, precore, mancozeb, propamocarb, manganese zinc carboxylate (Ank), dew-speed net, good intentions, and ruruba. However, there are several points to be explained here: First, the fungicide is divided into two types: the contact agent and the inhaler. Some people like to use the systemic agent to prevent disease. The systemic adsorbents are often highly targeted and have a relatively single site of action. They are easy to produce drug resistance; the killing agent has a broad spectrum of bactericidal effect, as long as the degree of atomization is good, after spraying on the surface of leaves and fruit. A very thin and dense protective film will be formed to prevent the invasion of bacteria. Therefore, it is advisable to use protective agents for disease prevention; when the disease is cured, the protective agent is mixed with the systemic adsorbent. The second is that drug compounding can improve the curative effect, especially when several diseases occur at the same time, it can play a role in treating multiple diseases and saving time and labor. However, it must be clear that before mixing, it is necessary to read the instructions to understand the active ingredients and the types of treatment of the selected drugs. Because there are some medicines that use the name of the commodity and are themselves a compounding agent. In addition, even if a single dose is not more than two kinds at the time of mixing, mixing too much is a waste, and it is easy to cause injury.
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