Rose diseases and insect pests: harmful symptoms and control methods of rose stem wasp

Many flower friends are familiar with the rose leaf-cutting wasp, but the rose stem wasp is probably unfamiliar. In this paper, we first understand the knowledge about the rose stem wasp, in learning how to control the rose stem wasp, and strive to let the flower friends see the useful information.

Rose stem wasp: also known as rose stem wasp, rose stem wasp, rose drill worm, etc., in addition to harm to rose, rose, yellow thorn rose and so on. The main way of harm is that the larvae eat food in the pith of the stem, destroy the dredging tissue of the stem, and hinder the water and nutrients.

The specific manifestations of stem bee injury are as follows: branch breaking, wilting, withering, sprouting at the base, blackening and sagging of tender shoots, etc.

Rose stem wasp control: when the rose stem wasp is found, the damaged branches should be cut off at any time (until there is no decay in the stem pith) and destroyed. In addition, when we prune in winter, we must cut off the branches that are found to be infected with worms. if we find that the worms are injected into the roots, we can use a syringe to inject 50 times the 6% imidacloprid EC 5-10ml into the hole and seal it with soil immediately.

For ordinary flower friends, in addition to dealing with branches, it is best to select varieties, properly consider some insect-resistant varieties.

Control methods of diseases and insect pests in rose potted plants

Rose black spot: the pathogen mainly infects leaves and also harms petioles, twigs, pedicels and petals. At the beginning of the disease, the leaves appeared black spots, gradually expanded into a purple-brown edge of the disease spot, many black particles scattered on the disease spot, the later disease spot connected, the leaf became yellow and fell off. The pathogen is a fungus, overwintering on a diseased body with hyphae or conidia. Sporadic occurrence occurred in Beijing in the middle of May, entered the initial stage in the first and middle of June, reached the peak in mid-August, and decreased in September. The lower old leaves fall off ahead of time, which is easy to form bare legs. You need: reasonable fertilization, pay attention to irrigation mode, moderate pruning, ventilation and light transmission, improve disease resistance; clean up the diseased branches and leaves in time to reduce the source of infection; at the initial stage of the disease, spraying 1000-fold solution of 75% chlorothalonil wettable powder, or 400-fold solution of chlorothalonil, spraying once in 10 to 15 days for 5 to 6 times in a row can control the occurrence of the disease. Select disease-resistant varieties, such as rose 'Strawberry Ice Cream', 'horseshoe', 'queen', 'Mannheim' and so on.

Rose powdery mildew: mainly occurs on leaves and sometimes spreads to twigs and buds. The initial stage of the lesion is chlorotic macula, and the tender leaves are wrinkled, curled or deformed. In serious cases, the whole leaf is covered with a layer of white powder, the leaf twists and turns, the shoot bends, the bud does not grow, the bud withered, and the flower cannot bloom normally. The pathogen is fungus, which overwinters with mycelium on diseased buds, diseased branches and diseased leaves of host plants, produces conidia in the following spring, spreads by wind and rain, and invades directly. The disease was severe in Beijing from May to June and from September to October. Continuous rain in early summer is not conducive to the disease, and high temperature and humidity after rain is conducive to the occurrence of the disease. In addition, the application of too much nitrogen fertilizer is also easy to occur.

You need to strengthen cultivation management and improve plant disease resistance, such as increasing the application of phosphorus and potassium fertilizer, ventilation and light transmission; timely cleaning of diseased branches and leaves in order to reduce the source of infection; the control effect is better with 100-150 times of Nongkang 120 or antibiotic B010 emulsion. At the initial stage of the disease, the use of domestic 75% + trimorpholine emulsion 1000 times or the use of Antaisheng 700x solution for prevention and treatment.

Rose diseases and insect pests-nematodes, how to remove?

Rose mainly has landscaping, environmental protection value, medicinal value and ornamental value, the flowering period is very long, so how to breed rose nematode pests?

Nematodes mainly damage the roots of flowers. When nematodes occur, the leaves of the plant turn yellow, the leaves become smaller, lack of vitality, and the quality of cut flowers is low. when pulling up and checking, you can see nodular root knots of different sizes, which are yellowish-white at first, smooth and solid, and then turn yellowish brown. The roots of diseased plants are weak and few, and even cause rot and hinder their growth. There are more than 10 species of nematodes that harm rose.

The harm of cut rose production to nematodes in China is still lack of sufficient understanding. The plants during the production period should be dug up and checked regularly, especially for those areas with poor growth, the harm of nematodes should be considered.

Control methods of rose nematodes:

1. First of all, it is necessary to start with the seedlings. The rootstocks should be soaked in 45% insecticidal 1000 times solution for 30 minutes. The land where seedlings are planted should be rotated.

2. The soil should be disinfected before greenhouse renewal and replanting.

3. The drugs to kill nematodes are Tiemiake, Kexidan and so on.

The above are the symptoms and control methods of rose nematode pests.