The latest control methods and matters needing attention of wheat sheath blight
Wheat sheath blight can be infected in different growth stages of wheat. after the emergence of wheat seedlings, the pathogen of summer in the soil infects the underground stem and stem base leaf sheath of wheat seedlings. After the wheat turned green, light brown oval or rhombic disease spots appeared on the leaf sheath at the base of the damaged wheat seedlings, gray in the middle, brown on the edges, and some of the disease spots were slightly longitudinally split.
After wheat entered the jointing stage, it was the time when sheath blight invaded the stem, but in this period, because the wheat sheath blight mainly occurred at the base of the stem of the plant, the symptoms were hidden, it was easy to be ignored and missed the best time to control.
When the pathogen invades the stem from the leaf sheath, it often causes stem wall necrosis and softening, longitudinal cracking of the diseased part, plant dehydration and death, wind and rain weather, lodging and serious yield reduction. In general, the yield of diseased fields can be reduced by about 10%, and that of heavy ones can be reduced by 30% to 40%.
1. Prevention and control methods
To control wheat sheath blight, we should irrigate reasonably, prevent vigorous growth, avoid excessive humidity among plants for a long time, and remove weeds in the field in time. The key period of chemical control of wheat sheath blight is the turning green and jointing stage. Now is the time to water the wheat field, and it is also the time when sheath blight spreads with the water. if it is not controlled at this time, it will invade the first stem node of wheat after jointing and destroy the stem. General chemical control with 70% methyl thiophanate wettable powder 75 grams, or 25% propiconazole EC 20: 30 ml spray.
2. Points for attention when spraying
① should focus on the stems infected by sheath blight.
Two buckets of water are sprayed on one mu of land in ②. If there were more white ears in the wheat field last year, the dosage must be increased to three buckets of water. Wheat sheath blight is generally controlled twice, the first time when the diseased plant rate reaches 20%-30%, and the second time after 10-15 days.
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