Pepper grey mould of the onset of symptoms
Main harm seedlings pepper grey mould was grasped.After disease early leaf apex yellowing, extended to the young stem of cotyledon.Stem brown or dark brown irregular disease spot.Young plants are often department break from his illness and death.In damp environment, disease developed gray mold, the pathogen of conidium terrier and conidium.
Law of pepper grey mould was grasped
Germs on sclerotium overwintering in the soil, can also be conidium wintering in the sick body.Low temperature, high humidity environment susceptible;Pathogen spores in 15 ℃ ~ 20 ℃ low temperature easy formation;Plastic greenhouse in early spring, low temperature, high humidity susceptible.Growing too close, poor ventilation, insufficient light weight.
Pepper grey mould of comprehensive prevention and control measures
1. To establish a disease-free seedling bed
Choose the terrain, dry lee xiangyang, convenient drainage, soil fertile, born not planted peppers crop seedling raising, seedbed soil with 50% carbendazim wettable powder and 50% thiram wettable powder 1:1 mix, per ㎡ medication 8-10 g mixed with fine soil 15-3 o kg, when planting a third lay on the bed surface, the remaining two-thirds on seed or covered by green heng 1 per ㎡ 1 g of 3 000 times liquid spraying water bed.
2. PengShi disinfection
Years of greenhouse greenhouse planting, because the bacteria source quantity accumulated more, 7 - in August in the summer, the commune reservoir, the ground effect of 7 d, use high temperature sterilization, or with 50% carbendazim each tent 1-1.5 kg, broadcasting with fine soil ground, and then the commune of sterilization.Every space with sulfur before engraftment 7-8 g, plus 15 kg sawdust blending, in the evening light, airtight fumigation 24 h, the effect is better.
3. Clean the pastoral
Growth period, timely diseased flower, leaf, fruit, and into the plastic bags at any time, out of the field outside the deep, after harvest, thoroughly remove strain residue, concentrated fire source reduction.
4. To strengthen the water management
Again rotten high quality organic fertilizer, increasing under phosphorus application, improve the plant disease resistance, proper control of water, conditional can use drip irrigation, flood irrigation is prohibited.
5. Timely ventilated platoon is wet
Humidity is the main condition of grey mould of onset, greenhouses in ensuring optimum temperature (generally add ℃) as the premise condition, whether early or results, more attention should be paid to ventilated platoon is wet, normal day at sunset short time keep fresh PengShi humidity no more than 70%, this is one of the important measures to prevent and mitigate grey mould was grasped.
6. Control
Before engraftment spirit with 50% speed of wettable powder 800 times liquid, or with 50% carbendazim wettable powder 800 times liquid, and spraying seedbed to disease-free seedling into the tent.
Early onset, the selection of wettable powder 1 0 50% speed grams of spirit (30 times liquid, 50% at sea because of the wettable powder 1000 times liquid spray once every 7-10 d, also can use 10% speed, ling smoke agent or 45% chlorothalonil smoke agent per 667 ㎡ with 180-250 g, in the evening closed shed fumigation, 7-8 d smoked, smoked 3-4 times.Grey mould of serious when, can choose 40% its mould amine, b mould, more oxygen toxin pesticide rotation alternately, different bacteria such as urea, improve the control effect, delay the drug resistance.
