Botrytis control techniques

Date:2014/6/19 15:55:20 Hits:99

  Botrytis is heavy on tomato harm and common diseases, each dish area have occurred. In addition to damage tomatoes, but also crimes against eggplant, pepper, cucumber, gourd and other 20 kinds of crops. Cold, rainy weather and more years of continuous serious harm. Causing leaf and a lot of burnt dead, rotting, severe onset of a direct impact on production.

  Botrytis damage symptoms

  Stems, leaves, flowers, fruit can be harmful, but the main damage fruit, fruit onset is usually heavier. When infected stems were soaked start small point, after extended oblong or irregular in shape, light brown, lesion surface humidity when raw gray mold layer (conidia and conidiophores), severe Department of dead stems and leaves more pathogenic cause blight. From the onset of multi-blade tip portion starts along the ridge between a “V”-shaped inward expansion, beginning was soaked after expanded to brown, irregular edges, Physalospora, sick, healthy tissue boundaries obvious shades of white, Health and a small amount of white mold surface layer. Fruit infected residual stigma or multiple petals before being infested fruit or stalk to the expansion, resulting in skin was gray, and gave birth to a thick layer of gray mold, rot was like water.

  Occurrence of Botrytis cinerea

  Pathogen Botrytis cinerea fungus imperfect grapes Amon. Bacteria mainly sclerotia (cold areas) or mycelium and spores of stem (warm regions) with plant debris left behind in the soil summering or winter, when conditions are suitable for germination hyphae produce spores, by the airflow, rain and people spread production activities. Spores rely on air currents, from wounds or aging organs invade host disease. Weak parasite bacteria can live on organic saprophytic camp, under the scant sunlight conditions, the air humidity above 90%, 4 ℃ ~ 31 ℃ to the disease, but growth temperature of 20 ℃ ~ 23 ℃, the highest 32 ℃, the lowest 4 ℃, humidity demanding onset relative air humidity up to 90% humidity to maintain a long time, a serious disease; scant sunlight, proper temperature (about 20 ℃), relative humidity (over 90%) is in favor of the disease. Weak growth of the host, easy to induce the disease.

  Greenhouse tomatoes in early spring, generally Year Botrytis cinerea in tomato leaves showed significant origination period, three stages Sheng period and the end of the Offer Period: after planting early March to early April is the originator of Botrytis leaf period, the condition is more stable; late April to early April is the rise of Botrytis leaf, disease rapidly expanding; late April to late May into the peak incidence, but there are differences between years. Production continued low humidity, seedling sick, fertilizer and excessive application of plant growth regulators dipped flowers are an important cause of Botrytis cinerea occurred. Botrytis fruit occurrence of disease often seen in 20-25 days after planting, the first spike fruit onset by the end of March, mid-April to early May, Sheng period into the future with increasing temperature, increasing the amount leaked, illness slow expansion; second spike in early April if more than late onset, by the end of April to early May into the peak incidence; third onset spike fruit 15 days after the onset of the second spike fruit, fruit disease early May to begin decline.

  Control methods

  First, the chemical treatment

  1 If you have already started the disease, prevention of drug use:

  In early prevention, drug master three critical periods, namely the seedling stage, early flowering, fruit enlargement.

  (1) seedling: Choose disease-free before planting seedlings transplanting.

  (2) early flowering: fruit when first flowering spike, uniform foliar spray dry charcoal gray cream 1 +1 prevention.

  (3) fruit enlargement: fruit reminder before pouring water (especially in the pouring of the first and second spike reminder fruit fruit water) a day cream charcoal gray spray dry 1 +1.

  (2) drug treatment:

  (1) When the initial issuance of Botrytis generally showed only the lower part of the ruins of the old leaves and flowering,

  Control methods (2) in the late onset, can be used in integrative medicine, greenhouse tomato gray mold prevention techniques.

  Second, the physical control

  Control methods integrated control measures with tomato blight.

  Watch out! When removal of diseased fruits diseased leaves, the use of plastic bags trap before removal to avoid improper operation, distribute germs spread disease.

  1 seed ozone sterilization process: Before the next breeding seeds, seeds soaked with ozone water for 40-60 minutes.

  Two large empty shed ozone sterilization dose: Before transplanting seedlings, leaked closed mouth with a large dose of ozone gas sterilized air shed.

  3 using RTBF-300 disease control machine, sealed greenhouse space for air to automate regular quantify ozone sterilization.