According to atmosphere bureau report, recently inside 3 days, area of and other places of Shaanxi, Gansu Province, gale of the strong precipitation that has large area, thunderstorm. Below extreme soup, young fruit can hold out the past, see the administrative measure of fruit grower even. Remind everybody here, rain wants to notice speckle of prevention and cure is ill surely more recently, speckle disease sends ill rate, have affinity with orchard humidity, especially after rain, want seasonable prevention and cure to invade catch.
Speckle disease is just as cancer, once come on, in expressing terminal, orchard lamina can fall quickly. This tells us, to speckle disease must prevent early assistant, early, if let this bacteria conceal come down, deciduous leaf is sooner or later thing. Come on in last few years according to speckle disease the rule that shift to an earlier date, if in May the last ten-day of a month begins,use 10 thousand show only, accomplish what do not exceed period of efficacy to use drug, effect of control of annual speckle disease is very ideal.
Experience makes clear, speckle disease is in commonly the last ten-day of a month came in May June the first ten days of a month only then leaf seeing disease, 7~8 month is entered fill period. But observe in recent years, speckle disease already had apparent come on ahead of schedule trend, some orchards are in the first ten days of a month can appear in June serious lamina falls off phenomenon, some orchards arrive 7, whole August tribe is smooth, affected fruiter later period badly grow to be accumulated with nutrition, weakened tree power greatly, cause cankered disease to happen greatly.
Fruiter speckle disease achieves 24 ℃ , humidity to achieve 80 ％ to begin to invade in air temperature catch. Normal time wants only the last ten-day of a month came in May the first ten days of a month was met in June small to moderate rain, invade caught condition with respect to disease of can contented speckle. Speckle disease goes Yo period is the 3 days shortest, the 31 days longest, vaccinal in May go Yo period is long, began to shorten in June, between 7~8 month the shortest. Accordingly, if early days goes when Yo period is longer use drug not in time, sure cause later period to erupt centrally.
Among plan of happy in middle peasant speckle disease prevention and cure, from May the middle ten days of a month begins, observe precipitation condition, if rainfall exceeds 2 millimeter, make knot of fruiter face of blade shows 6 hours, the bacteria can be invaded catch, and rainfall duration is longer invade acquire an amount bigger, if a kind of green tea does not have useful protection antiseptic inside 5 days, so be about to use drug instantly after rain, every night a day, the effect is reduced 20% .
If the last ten-day of a month in May appears successive rainfall, a lot of orchards are invaded possibly to catch by speckle disease. Be about to adjust the time that use drug and drug in time according to precipitation circumstance on prevention and cure, and cannot use drug step-by-steply according to fixed time-interval. To a kind of green tea the orchard that protective agent did not use inside 5 days, pluvial hind should undertake preventing and cure with 10 thousand show instantly.
Anyhow, the prevention and cure of speckle disease key period was May in the last ten-day of a month arrives in June of the first ten days of a month invade first catch period, must here period speckle disease control is in 0.5% less than, otherwise, after coming in monsoon, control disease very hard, encounter weather of the rain that join nether world especially, tian Gangqing is to rain, the fruiter cannot use drug at all.
