First, the boxworm
Major hazards: Silk cotton, boxwood, Euonymus, eucalyptus, poplar, willow, and similar plants. The larvae primarily feed on leaves, then move to tender shoots, eventually causing the entire plant to die. This pest can produce one or two generations per year, with overwintering stages in the soil. Adults are nocturnal, hiding during the day and becoming active at night for mating and laying eggs. Eggs are laid in double rows or blocks on the underside of leaves, ranging from dozens to hundreds. They hatch between 5:00 AM and 8:00 AM, after which the larvae drop to the ground. These adults are not strong fliers but are highly attracted to light.
Control methods include using light traps during adult emergence, manually removing adults early in the morning, and applying insecticides such as 50% imidophos emulsion diluted 200 times, 50% phoxim oil diluted 500 times, or 25% carbaryl wettable powder diluted 300–500 times. Additionally, during peak egg-laying periods, remove eggs and newly hatched larvae from surrounding weeds and till the soil in winter to destroy overwintering insects.
Second, the moth
Species include yellow moth, brown green moth, flat moth, and others. They mainly attack hardwoods like poplar, willow, amaranth, acacia, cherry blossom, red maple, waxberry, crape myrtle, sweet-scented osmanthus, and big-leaved boxwood. Two generations occur annually, with larvae overwintering in the soil. Adults are nocturnal, attracted to light, and lay eggs on the underside of leaves in clusters. Newly hatched larvae initially do not feed, but later develop into leaf-eaters, damaging leaves progressively. Control involves targeting early-stage larvae, using light traps, and spraying insecticides such as 20% diflubenzuron, 50% phoxim, or 50% marathon EC. Winter pruning and soil cultivation also help reduce populations.
Third, Lagerstroemia velvet
This pest mainly affects crape myrtle, pomegranate, and mulberry. Both adults and nymphs feed on buds, leaves, and branches, excreting honeydew that leads to blackened leaves, leaf drop, and reduced ornamental value. There are 2–3 generations per year, with nymphs overwintering in branch crevices. Control includes scraping off pests with brushes, spraying insecticides like 25% iminophos or 40% phosphorus-based EC, and pruning and burning infested branches.
Fourth, Green butterfly
Mainly affects Eucalyptus, Nan, Laurel, Cinnamon, Avocado, Citrus, and other plants. Larvae feed on young leaves, increasing their consumption as they grow. One or two generations occur yearly, with larvae overwintering on host plants. Adults emerge at night, mate, and lay eggs on new leaves. Control measures include inspecting seedlings, spraying insecticides early, and removing overwintering pests during winter management.
Fifth, Cyclovirobuxine powdery mildew
Symptoms include white powdery patches on both sides of Euonymus japonicus leaves, leading to yellow spots and leaf deformation. The fungus survives the winter in infected tissues and spreads in spring via conidia. High summer temperatures suppress the disease, but spores increase in autumn. Control involves proper pruning to improve air circulation, and applying fungicides like 20% Triadimefon, 50% thiophanate, or 50% carbendazim when symptoms first appear. Repeated applications are recommended for effective control.
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