How to control diseases and insect pests of flower seedlings in winter? Control techniques of Diseases and insect pests in Flower seedlings

How do flower seedlings prevent pests in winter? Winter temperature is low, easy to lead to part of the flower seedlings above the ground frozen death, although some in the spring of the next year will grow again from the roots, but the cultivation and management of winter flower seedlings can not be taken lightly, need to do a good job of pest control measures, to ensure that flower seedlings in winter cold weather can also grow normally, specific measures are as follows.

1 Ensure that the growing environment of flowers and seedlings is clean

When the temperature is lower than 0 degrees, it is easy to cause flowers and seedlings to wither and rot, breed bacteria and cause flowers and seedlings to be infected, and these bacteria will cause harm to flowers and seedlings after the weather warms up. Therefore, after winter comes, it is necessary to clean up the plant growth environment regularly, uproot the redundant plants and take them out of the garden to bury or burn them, so as to prevent the diseased bodies from infecting healthy plants with bacteria. In addition, while carrying out clean-up work, managers should also disinfect themselves to prevent artificial transmission of pests and diseases.

2. Clean branches and leaves affected by pests and diseases

Winter pruning is an important part of flower seedling management, and before the temperature drops, the staff should remove the branches and flowers affected by pests in time to prevent the occurrence of pests and diseases. Before pruning, the staff should fully understand the relevant pruning knowledge of different seedlings, master the symptoms of diseases and insect pests, and do a better job of pest control and pruning management in a more comprehensive and effective way. Take kumquat as an example, when kumquat root rot occurs, you can obviously see kumquat branches and leaves yellow, wither, at this time, all withered branches and leaves should be cut off, and the soil should be replaced in time to ensure proper humidity, effectively prevent the occurrence of diseases and insect pests.

3 Renovation of soil

Before transplanting flower seedlings, the soil should be renovated, mainly to eliminate germs and eggs in the soil in time. If there are too many pests in the soil, it is necessary to replace the new soil, and before the replacement, the soil should be disinfected and supplemented with charcoal ash. Of course, this method is mainly suitable for the cultivation of small-scale flower seedlings. For large-scale nursery stock cultivation bases and natural forests covering a wide area, after soil renovation, birds and insects will eat the insects that have been turned to the ground. After that, the staff will clean the soil again and renovate it again to turn the missing pests and eggs underground. These pests and eggs will die naturally due to insufficient air supply.

4 Branches coated with protective liquid

After winter comes, in order to avoid flower seedlings suffering from low temperature and pest damage, lime and water can be used to prepare protective liquid applied to the branches of flowers and seedlings, which can play a certain protective role. At the same time, when preparing the protective liquid, pay attention to the details of lime treatment, and there must be no lumps in the protective liquid. When applying, protective tools (such as plastic gloves) must be worn, because lime and water contact will produce a high heat chemical reaction, with protective tools to avoid burns.

5 Spray or irrigate pollution-free liquid medicine

When carrying out pest control on flower seedlings, suitable pollution-free liquid medicine should be selected according to different seasons for spraying or watering, and different pesticides for different flower seedlings are also different. For example, the kumquat pest control fluid is mixed with monothioate and water in a ratio of 1:800, while the magnolia pest control fluid is mixed with sulfomethion emulsifiable concentrate and water in a ratio of 1:1 000.

Prevention and Control of Diseases and Pests of Flower Seedlings in Winter

As the temperature gradually decreases, most of the flower seedlings will enter the overwintering (or dormancy) state in various ways. During this period, all kinds of pests were basically inactive and mobile, which was a good season for pest control. Practice proves that the effect of winter control is directly related to the occurrence of pests and diseases in the next year. If the winter control measures are effective, the occurrence and damage degree of pests and diseases in the next year can be greatly reduced, and the effect of twice the effort can be achieved.

I. Cleaning up the nursery

Most of the pathogens (bacteria) or overwintering eggs of flower seedling diseases and insect pests overwinter in the litter or weeds in the nursery, and then come out when the conditions are suitable in the coming year. Therefore, in winter, the litter and weeds in the nursery will be completely removed and destroyed, and the sanitary conditions will be improved, which can greatly reduce the sources of various diseases and pests. This has significant effect on controlling anthracnose, powdery mildew, rust, red spider and moth of rose, chrysanthemum, begonia and willow.

2. Cut off branches and leaves with diseases and insect pests

Winter pruning is one of the important links in nursery management. In combination with winter pruning, focus on cutting off branches and leaves with diseases and pests, such as eggs on flowers and trees such as roses and roses, scale insects on poplar, willow and flowering shrubs. The cut branches and leaves with diseases and pests shall be cleaned up in time and transported out of nursery for centralized destruction treatment.

III. Deep ploughing in winter

Deep ploughing in winter can cause mechanical damage to larvae, pupae and eggs of underground pests lurking in the soil, such as grubs, ground tigers and mole crickets. After being exposed to the surface, they can be pecked by natural enemies such as birds. If necessary, artificial killing can also be adopted. In addition, deep ploughing can bury the pathogens in the surface layer of the soil into the deep soil layer, and the pathogens in the deep soil layer are turned to the ground, destroying the suitable environment for pests and diseases, and effectively controlling the occurrence of pests and diseases.

IV. White protection

Branches coated with white can not only effectively prevent winter flowers and trees from freezing injury, improve the disease resistance of flowers and trees, but also destroy the overwintering sites of pests and diseases, playing a dual role in both freezing and killing insects. Especially in the bark of winter mites, such as the role of scale better. Special attention should be paid to the fact that quicklime must be fully digested, otherwise it will easily cause burns after being applied to the branches of flowers and trees.

V. Drug control

Since most of the pests are dormant in winter, winter drug control measures can be adopted for those pests that are difficult to control in the occurrence season. For example, 50-100 times of oil emulsion can be sprayed to control scale insects, and spraying 1% Bordeaux mixture 2-3 times in late winter can play a good role in controlling pear rust, rose black spot and other diseases.

Prevention and control of plant diseases and insect pests in winter

With the gradual decrease of temperature, most diseases and insect pests infecting flower seedlings will enter the hibernation state in various ways. During this period, all kinds of pests are basically inactive or have little mobility, which is the favorable time for prevention and control. Practice proves that the effect of winter control is directly related to the occurrence of pests and diseases in the next year. If the measures are effective, the occurrence and damage degree of pests and diseases in the next year can be greatly reduced. At the same time, it can also minimize the use of chemical pesticides.

The pathogens or overwintering eggs of most flower seedlings in the nursery are overwintered in the litter or weeds in the nursery and will come out again when the conditions are suitable in the coming year. Therefore, in winter, the litter and weeds in the nursery will be completely removed and destroyed, and the sanitary conditions will be improved, which can greatly reduce the sources of various diseases and pests. This has significant effect on controlling anthracnose, powdery mildew, rust, red spider, moth and other flowers and trees such as rose, chrysanthemum, begonia and willow.

Winter pruning of branches and leaves carrying diseases and pests is one of the important links in nursery management. In combination with winter pruning, focus on cutting off branches and leaves with diseases and pests, such as eggs on flowers and trees such as roses and roses, scale insects on poplar, willow and flowering shrubs, etc. The cut branches and leaves with diseases and pests shall be cleaned up in time and transported out of nursery for centralized destruction.

Deep ploughing in winter can cause mechanical damage to larvae, pupae and eggs of underground pests lurking in the soil, such as white grubs, ground tigers and mole crickets. After being exposed to the ground, they can be pecked by birds and other natural enemies. Artificial killing can also be adopted when necessary. In addition, deep ploughing can bury the pathogens in the surface layer of the soil into the deep soil layer, and the pathogens in the deep soil layer are turned to the ground, destroying the suitable environment for pests and diseases, and effectively controlling the occurrence of pests and diseases.

Coating white can not only effectively prevent the freezing injury of flowers and trees in winter, improve the disease resistance of flowers and trees, but also destroy the overwintering place of pests and diseases, playing a dual role of both freezing and killing insects. Especially in the bark of winter mites, scale insects and so on better role. Special attention should be paid to the fact that quicklime must be fully digested, otherwise it will easily cause burns when applied to the branches of flowers and trees.

Drug control Because all kinds of pests and diseases are mostly dormant in winter, drug control can be used for those pests that are difficult to control in the season. For example, 50~100 times of oil emulsion can be sprayed to control scale insects. Spraying 1% Bordeaux mixture 2~3 times in late winter can play a good role in controlling pear rust, rose black spot and other diseases.