Spring greenhouse rose beware of disease and pest

March and April are the important stages of rose from recovery to rapid growth in the greenhouse, and it is also a period when many kinds of diseases and insect pests are more active. During this period, special attention should be paid to the control of downy mildew and red spider.

Downy mildew is a room disease, which occurs occasionally in the open field after the expansion of leaves of the rose, mainly due to the lack of effective evaporation of moisture in the tillage layer or pot soil in the greenhouse for a long time. During the onset period, the leaves wilted and wrinkled with white powder, the whole plant lost its apical dominance, and then the leaves fell off and stopped growing. The disease has the characteristics of rapid onset and rapid spread. under the same circumstances, it can infect half or the whole greenhouse rose in half a day or a few days, with serious consequences.

In order to prevent the occurrence of this disease, it should be ventilated as much as possible after leaf spreading, and the open □ should be expanded as much as possible. When there is no strong wind at night and when the □ is above 5 degrees Celsius, it does not have to be closed. If it is found that the leaves are wilted and accompanied by white powder, chlorothalonil powder should be quickly mixed with 5OO solution to spray wine thoroughly and cleanly on the whole greenhouse rose, including other uninfected roses. Watering during the recovery period should also be halved until new leaves grow.

Red spider does harm to almost all crops, which occurs in most areas of our country, especially in the closed greenhouse environment and open field. The harm of red spider to rose occurs in the greenhouse environment after leaf expansion and in the open field from mid-late April to late June. The air-dried greenhouse is very easy to cause a big outbreak of red spiders. At the initial stage of the disease, there are very dense yellow spots on the leaf surface of the lower half of the plant, and red spiders suck up juice on the back of the leaves. In the later stage, the leaf surface of the whole plant was covered with red spiders and branches were covered with red spiders, and the number of □ increased sharply, which made the flowers shrink, lose their beauty, lose their vitality and cause serious damage. The disease is based on prevention and requires a combination of prevention and treatment.

l. Pay attention to ventilation and cooling in the process of daily maintenance, no matter in the greenhouse or potted plants, enough space should be maintained between plants and pots to facilitate ventilation.

two。 It is not suitable to pile up weeds, dried wood and other sundries that have nothing to do with rose around the planting ground.

3. Technicians should observe every day that red spiders are harmful, and immediately use special acaricidal drugs such as triclofenac to spray wine thoroughly on the infected plants and other undamaged rose, and spray wine once every 4 to 7 days according to this method. Production enterprises should strengthen the awareness of prevention, prevent it gradually, and reduce the loss to the minimum.

Spring greenhouse rose beware of disease and pest

March and April are the important stages of rose from recovery to rapid growth in the greenhouse, and it is also a period when many kinds of diseases and insect pests are more active. During this period, special attention should be paid to the control of downy mildew and red spider.

Downy mildew is a room disease, which occurs occasionally in the open field after the expansion of leaves of the rose, mainly due to the lack of effective evaporation of moisture in the tillage layer or pot soil in the greenhouse for a long time. During the onset period, the leaves wilted and wrinkled with white powder, the whole plant lost its apical dominance, and then the leaves fell off and stopped growing. The disease has the characteristics of rapid onset and rapid spread. under normal circumstances, half or the whole greenhouse rose can be infected in half a day or a few days, and the consequences are very serious.

In order to prevent the occurrence of this disease, it should be ventilated as much as possible after leaf spreading, and its exposure should be expanded as much as possible. It is not necessary to close the exposure at night when there is no strong wind and when it is more than 5 ℃. If it is found that the leaves are wilting and accompanied by white powder, the chlorothalonil powder should be quickly blended with 500 times liquid, and the whole greenhouse rose, including other uninfected roses, should be sprayed cleanly and thoroughly. Watering during the recovery period should also be halved until new leaves grow.

Red spider does harm to almost all crops, which occurs in most areas of our country, especially in the closed greenhouse environment and open field. The harm of red spider to rose occurs in the greenhouse environment after leaf expansion and in the open field from mid-late April to late June. The air-dried greenhouse is very easy to cause a big outbreak of red spiders. At the initial stage of the disease, there are very dense yellow spots on the leaf surface of the lower half of the plant, and red spiders suck up juice on the back of the leaves. In the later stage, the back of the leaves and branches of the whole plant were covered with red spiders and pulled silk to form a web, and the number of insect population increased sharply, which made the flowers shrink, lose their beauty, and the whole plant lost its vitality, and the harm was very serious. The disease is based on prevention and requires a combination of prevention and treatment.

1. Pay attention to ventilation and cooling in the process of daily maintenance, no matter in the greenhouse or potted plants, enough space should be maintained between plants and pots to facilitate ventilation.

two。 It is not suitable to pile up weeds, dried wood and other sundries that have nothing to do with rose around the planting ground.

3. Technicians should observe every day, once the red spider harm is found, immediately use triclofenac and other special anti-mite drugs to comprehensively and thoroughly spray the diseased plant and other undamaged rose, and spray every 4 to 7 days in accordance with this method. Production enterprises should strengthen the awareness of prevention, prevent it gradually, and reduce the loss to the minimum.