Home › Nursery Stock › Article

What are the control methods for red spider mites on rhododendrons?

Nursery Stock 0 views
The female adult is about 0.3 mm long, dark red, nearly oval, with a raised back and 4 pairs of dark red legs; the male adult is 0.25 mm long, wedge-shaped, flat and bright red. It produces multiple generations a year, and the adults overwinter at the base of the plant. They mainly cause damage on the underside of leaves near the midrib close to the petiole. During the high-temperature, low-rainfall, dry weather of June to July, they reproduce quickly, and when their numbers are high, the damaged leaves scorch and drop off. Control methods: manual control - check frequently after April, and if red spider

The female adult is about 0.3 mm long, dark red, nearly oval, with a raised back and 4 pairs of dark red legs; the male adult is 0.25 mm long, wedge-shaped, flat and bright red. It produces multiple generations a year, and the adults overwinter at the base of the plant. They mainly cause damage on the underside of leaves near the midrib close to the petiole. During the high-temperature, low-rainfall, dry weather of June to July, they reproduce quickly, and when their numbers are high, the damaged leaves scorch and drop off.

Control methods: manual control - check frequently after April, and if red spider mites are found on a few leaves, remove the infested leaves promptly and burn them. Where conditions permit, natural enemies such as ladybugs, green lacewings, and thrips can be released manually for biological control. If red spider mites are found on many leaves, chemical control can be used, such as spraying 40% dicofol at 800 to 1000 times dilution, which has strong killing power against adults, nymphs, larvae, and eggs; as long as it is sprayed evenly, the effect is good.

Related Articles