Pay attention to control autumn lettuce downy mildew
Downy mildew mainly damages the leaves of lettuce, which can occur from seedlings to adult plants. The air humidity is high, and the heavy smashing plots and the late growth stage are heavier. The lower leaves of the plants began to develop. The leaves began to appear as water-soaked dots and gradually developed into pale yellowish round lesions. The late lesions expanded in an irregular shape and the color turned yellow-brown. When the damp spots appeared sparse on the back of the lesions. The frosty layer of mold eventually leads to dead leaves. Low temperature and high humidity are necessary conditions for the disease to occur. The epidemic of the disease can be caused by the continuous rain, many years of heavy rain, excessive planting, and premature watering.
Prevention methods: Two or more years of rotation are adopted to strengthen the cultivation and management. After harvesting lettuce, pay attention to clean gardens, adopt high ridge cultivation, prevent flood irrigation, and moderate close planting. Appropriate increase in phosphorus and potassium fertilizers. Early onset of the onset of 58% metalaxyl MnZn wettable powder 600 times, 72.2% Propyracarb, 600 times liquid, 69% dimethomorph MnZn wettable powder 600 times, 50% dexamethasone 1,000 times liquid agent spray. When the condition is severe, two sprays of the compound can be sprayed. The spray is sprayed 7 days apart and sprayed 2-3 times. The above agents are preferably used interchangeably.
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By setting a protective collar, the neck of the operator can be kept warm and protected. The provision of a hand guard is helpful for the surgical staff to temporarily place their hands in the hand guard while waiting during the operation, which plays a protective role and is more in line with the principles of aseptic operation and occupational protection.
By setting the shrinking cuffs, it is beneficial to make the cuffs fit the wrists, prevent the cuffs from loosening, and prevent the gloves from slipping off during the operation and the operator's hands are exposed to the gloves.
The design of the new humanized protective surgical gown has been improved in the key areas of the gown. The forearm and chest area are double-thickened, and there are handguards in front of the chest and abdomen. By arranging reinforcing sheets (double-layer structure) in key areas, it is beneficial to improve the water-permeability of surgical gowns and improve safety.
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