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        Rotten leek occurrence causes and control-澳门永利娱城

        Date:2012-09-28 11:25

        Say here " rotten leek " is the habit is called the pathogen infection caused by partial decay and leek blade sere phenomenon. Leek leek blight caused black may be, may also be leek botrytis, but at present is mainly gray mold of Chinese chive.
        One, damage symptoms
        Leek leek cinerea is protected in the production of the main diseases. Leek damaged leaf, leaf initial in front or back to produce white to grayish brown dots, general positive than back. When wet, lesion surface having sparse Brown mycophenolate layer. When severe, lesion connecting piece, causing the blade to the upper or the whole leaf scorched, later leaves on green to brown to gray mycophenolate layer of ash. Sometimes from cut chives cut down bad, initially assumes the water stains like pale green spots, the shape of a semicircular or " V" shape, disease tissue brown, grayish brown to grayish green surface villous mycophenolate layer.
        In two, route of transmission and pathogenesis of the condition
        Leek is a fungal infection caused by Botrytis cinerea. Pathogen sclerotium form in the soil potential overwintering. Sclerotium germination spore spore spread by air. Bacteria growth temperature is 15~30 ℃, the hypha growth temperature is 15~21℃, 27 ℃produced most sclerotinia.
        Three, prevention and cure method
        In 1, selecting resistant varieties.
        2, clean garden, will block the debris all Qing Dynasty, deep buried or burned to the ground.
        3, strict control of temperature (humidity ). To control the temperature (humidity) degree is the prevention of Botrytis cinerea by effective measures, the knife head leek growth period, the general temperature should not exceed 23℃, while night temperature not lower than 10~12 ℃. After the knife knife leek than raising temperature 2~3℃, but at last it should not exceed 30℃. Control of humidity to master near the buckle film without watering, buckle membrane after loosening the diminution of soil water evaporation, pay attention to vent moisture during the day, night pay attention to insulation, prevention and control of temperature difference between day and night is too big a leaf dew.
        4, smoke or dust prevention and control. For every 667 square meters with 3% thiabendazole smoke agent 250 grams, or 10% Pythium spirit 250~300 grams, point light, closed greenhouse, smoky night. Also every 667 square metre with 5% arc hymexazol dust agent per 1 kg, or more than 6.5% bacteria, mold Wiley dust agent 1 kg spraying, spraying a 7 day.
        5, spraying and. In 20% Triadimefon WP 500 times liquid spray, 7~10 days again for prevention. As of now the incidence, immediately spray 40% two a pyrimidine amine suspending agent 1200 times liquid, or 50% agricultural Lilingke WP 100 times liquid, or 50% rot Ling WP 1000 times liquid +50% flutter herink WP 1000~15000 times liquid; or 40% grams hymexazol WP 600 times, or the benefit of 50% WP 600 times liquid, or 78% fubol 500~600 dilution, or 50% iprodione wettable powder of 1000~1500 times, every 7 days for 1 times, 2 times with jet.

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