The problem of pests and diseases in rose breeding is a very common problem, and it is also a headache for other buddies. Some people have given up the cultivation of the Chinese rose. Specifically, we list the pests and diseases that often occur in the Chinese rose and the corresponding prevention and control methods. :
Thorn moth
The main larvae of the yellow-spotted moth, the green-edge green moth, the brown thorn moth, the mulberry moth, and the flat moth are intensively feeding on the leaves during the high temperature season. Control methods: Once discovered, should be immediately sprayed with 90% of the dipterex crystal 800 times, or with 2.5% methional 1500.
Scale insects
There are white rims, Japanese wax oysters, red wax worms, brown velvet scorpion, blow cotton scorpion, scorpion shield scorpion, snake eye scorpion, etc. The hazard is characterized by sucking the sap of young stems and young leaves, resulting in Poor growth of plants, mainly caused by high temperature and humidity, poor ventilation, poor light. Control methods: In its nymph hatching period, it can be sprayed with 25% of buprofezin WP 2000 times.
aphid
Primarily for the Chinese rose tuber, peach aphid, etc., they suck the sap of the young plant organs, damage the tender stems, young leaves, buds, etc., seriously affect the plant growth and flowering. Control methods: Spray with 10% imidacloprid wettable powder 2000 times in time.
Rose Three-leaf Bee
In the larval stage, dozens or more than one hundred clusters are harmed. In a short period of time, the leaves of the plants can be eaten. Only a few main veins remain, which seriously harms the normal birth of the plants. Control methods: A small amount of potted plants can be used to pick up leaves with a large number of larvae when they first emerge, and they are trampled to death. A large number of them can be sprayed with 75% phoxim 4000 times solution.
Cinnabar
It can occur from 10 to 16 generations a year. In order to make the larvae, pups, and rufous clusters harm to the back of the leaves, the eggs are produced on both sides of the lobe dorsal veins or under the gathered silk screens. Each female cockroach can lay 50 to 150 eggs, up to a maximum of 500. It takes only 10 days to 13 days to complete a generation at a temperature of 23 to 25°C, and takes about 7 days at 28°C. 8 days. The occurrence of pods in the hot and dry seasons often leads to a large number of dense white spots on the front of the leaves, with yellow spots on the backs of the leaves. Control methods: Once discovered, spray with 25% of B&R WP 2000 times in time.
Chafer
It is mainly composed of greenish green beetle, black cashew beetle, white star beetle, small blue beetle, etc. It often feeds on new leaves, tender shoots, and flower buds with adults, which seriously affects plant growth and flowering. Control methods: Use the adult dead nature to shake off in the evening. Using the phototaxis of the adult, blacklight trapping. In the adult feeding hazard, sprayed with 50% of malathion EC 1000 times.
Borer
Rose borers are the larvae of Chinese rose stem stalk bees. They bore holes in the stems and drill into the stems to feed. The branches are broken and the upper part is dead. The larvae are white, with a pale yellow head and about 15-17 mm in length. Adults have wings, body black, yellow on both sides of the abdomen.蛹 蛹 red. It usually occurs in one generation in one year and harms in May to June. It is a kind of harmful pest that causes overwintering in the stem.
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