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Main pests of red meat and pomelo
In our county, red spider infestations occur throughout the year. The affected leaves show numerous dense white spots, leading to chlorosis and loss of luster. Severe infestation results in leaf drop. Adult red spiders are nearly oval and dark red in color. Red spider activity peaks during two main periods: the first peak occurs from late April to late June, while a second peak is observed from mid-September to November. During July and August, when temperatures are lower, their activity declines. Effective control involves timely application of pesticides. In early February, spray Karmant at 2000 times dilution. From late April to mid-May, apply pyridazinone at 2000 or 2500 times. From mid-June to late January, use Karmant at 3000 times. A single spray in mid-September with 3000 times Karmant is also recommended. If the population is low, reduce the concentration to 3500 times. After mid-November, when fruit is harvested, spray 1500 times Karmant if the population is high. If infestation is sparse, spraying may be avoided until mid-December, when a rosin mixture can be used for combined control.
Rust spider, also known as rust wall, is one of the most common and damaging pests in grapefruit orchards. It damages fruits by destroying oil cells, causing the peel to turn dark brown, become smaller, and develop a sour taste. Leaves and fruits initially appear dusty, then develop a reddish appearance. Wounds on the pericarp are prone to infection, leading to serious damage. Prevention should begin in early May, early June, late July, and late August. Use 80% zinc sulfate at 500 times dilution and water ampholytic at 1000 times. Over time, combinations with other insecticides have proven effective.
Aphids are a major pest in young shoots during spring, summer, and autumn. They cause curling and deformities, secrete honeydew that leads to sooty mold, and spread viruses like Huanglong disease. Apply 50% malathion at 700 times or 80% dichlorvos at 1000 times, with 1–2 sprays per tip length of 0.5–5 cm.
Leafhoppers are prevalent in nurseries and young trees. They cause leaf miners and ulcers, especially between May and September. Spray every 5–7 days, targeting shoots 0.5 cm long, for 3–4 applications. Use chrysanthemum oil at 3000 times, Kezibao at 1500–2000 times, or methomyl at 2000–2500 times.
Swallow butterflies have five generations annually. Adults emerge after warm springs, lay eggs on young leaves, and larvae feed on foliage. Control with 80% dichlorvos at 1000 times or dipterex at 800 times.
Adult and nymph stages of scale insects pierce fruit to extract sap, causing fruit drop and reduced quality. Adults emerge in mid-November and spawn in March. Control with 50% malathion at 700 times or 80% dichlorvos at 800 times during nymph stages.
Bridge insects have three generations yearly. Larvae feed on leaves, spin silk, and move into the canopy. Use trichlorfon at 800 times or pine EC at 500 ml.
Scarabs are common in mountainous orchards, feeding on young leaves, flowers, and fruits. Apply foliar sprays of 1000 times liquid or 80% dichlorvos at 1000 times.
Tianniu (Pomelo Borer) larvae live in trunks and bore into bark. Adults emerge in May, laying eggs on trunks. Manually capture adults, scrape eggs, and inject insecticides into holes.
Scale insects such as brown round worms, sharp tips, wax whiteflies, and cottony cushion scales are common. Each has specific life cycles and control methods. Use Karmant, aqueous ammonia phosphor, malathion, or double acenaphthene during active seasons. In winter, pine resin mixtures are highly effective against multiple pests. The alkaline solution helps remove wax and block stomata, providing broad-spectrum control.