In order to solve these problems, the seven most common diseases and insect pests in summer need to be solved.

Be especially careful when maintaining rose in summer. Rose is afraid of muggy and humid environment, and it is easy to induce diseases and insect pests in excessive humid, stagnant water and muggy environment, especially the following seven kinds of diseases and insect pests. It is found that these diseases and insect pests should be dealt with in a timely manner, so that rose flowers can resume healthy growth and keep blooming.

Novice maintenance of rose is best to choose some varieties with strong resistance to diseases and insect pests, such as the common perfume rose, it is best to buy perennial grafted seedlings, it is easy to grow with very strong roots.

The environment for the cultivation of rose flowers must have sufficient light, and keep the direct light environment for more than six hours a day to be ventilated to avoid shade. In addition, when loosening the drained soil and watering the rose flowers, avoid directly watering the leaves. It is also necessary to spray medicine regularly to prevent diseases and insect pests, and clean up the withered branches and leaves around them.

Conservation of common diseases and insect pests of rose flowers:

The first kind: black spot

If the rose is raised in humid and muggy conditions, it is easy to be infected with black spot, the leaves will appear ugly black spots, the leaves will slowly fall.

The treatment of black spot is very simple. After all the side-by-side diseased branches are cut off with sterilized honey scissors, you can spray Dysen zinc solution or methyl topiramate solution once every five days for about four times. If you don't want to spray, you can spray milk directly with a mixture of milk and water at 1:2, which is particularly effective in the control of black spot.

The second kind: powdery mildew

Rose flowers are also susceptible to powdery mildew, which is a common fungal disease, especially when the environment is humid, soil water or lack of light. Avoid watering at night and directly on the leaves.

If it is found that rose flowers are infected with powdery mildew, be sure to spray Dyson zinc solution or methyl topiramate solution in time, spraying about 3 times a week.

The third kind: yellow leaf disease

Rose flowers in the case of too much watering, or alkali soil is easy to lead to yellow leaves, lack of iron in the soil is also easy to appear yellow leaves, planting rose flowers must avoid watering too frequently, too much water is easy to cause yellow leaves, constantly losing leaves. Be sure to wait for the basin soil to dry before watering, and choose loose and drained peat soil and compost soil to give some acid fertilizer regularly.

The fourth kind: embroidery disease

Maintenance of rose infected with rust is particularly troublesome, branches and leaves will appear brown spots, and then the whole leaf will turn yellow, in a dark and humid environment is particularly easy to cause fungal diseases.

When it is found that the leaves are infected with rust, the diseased leaves should be cut off in time and sprayed with some fungicides, such as the common chlorothalonil or methyl topiramate solution.

The fifth species: aphids

Rose flowers are easily infected with aphids, which at first hide in the back and buds of leaves, and are very small green bugs that can only be found by careful observation. They reproduce very fast, and once they are found, they should be cleared in time, otherwise they will even spoil the flowers.

Rose aphid spray is relatively simple, the most commonly used agents are imidacloprid and flower protection god, the simplest rough method is to use a faucet to wash away the aphids.

The sixth species: red spider

Red spider is a kind of small mite that is difficult to be found. the leaves infected with red spider will slowly turn red, and in serious cases, some small spider silk will appear on the leaves, which is easy to induce red spider in an over-dry environment.

Red spiders infected with rose can be sprayed with soapy water and water, preferably on a sunny morning. Of course, you can also spray directly, and the most effective agent is avermectin, which can spray the whole plant evenly.

The seventh species: leaf miner

If you find that there are white veins on the leaves of Chinese roses, but you can't see bugs, it's likely that leafminers are harmful to plants, and the leaves will slowly get thinner.

At present, there is no good method for leaf miners, we can only cut off the leaves infected with diseases and insect pests, and then spray some neem oil appropriately.

The eighth species: thrips

If the Chinese rose infects thrips, the plant will have deformed leaves and buds, and the leaves will look very awkward. If you look closely, you will find that there are small black jumpers around them, and they are thrips.

At this time, you must spray in time, the relatively simple and effective agents are dermatophyte, permethrin, Aktai and other medicines. the best time to spray and kill is in the evening, about twice a week.