Forest tree pest management in summer
In midsummer, the Shu Shu tree enters its active growth phase. However, this period also marks the peak activity of various pests and pathogens that threaten tree health, leading to varying degrees of damage. To manage these threats effectively, several targeted pest control methods are employed throughout the season:
First, pine caterpillars can be controlled by spraying a 25% malathion, 25% dimethoate, or 25% phoxim solution diluted at 2500–3000 times during the 6th instar stage in July.
Second, the American white moth is managed by applying 25% diflubenzuron and 40 ppm trichlorfon at a 1000-times dilution during late June to early July, targeting the 1st to 3rd instar larvae.
Third, for the big bag moth, sprays of 90% trichlorfon crystals (1000–1500 times) or 2.5% deltamethrin EC (5000–10000 times) are used in mid-July and late October. Alternatively, during late July to early August, holes are drilled into the trunk of dead trees, and 50% monocrotophos EC or 80% Phosphine EC (20–40 times, 3–5 ml per hole) is injected, followed by sealing with mud.
Fourth, the indigo leaf a can be treated by burning pupae clustered on the trunk or using 2.5% deltamethrin emulsion (8000–10000 times) and 40% omethoate (2000 times) in early July.
Fifth, the larch sheath moth is controlled by applying pentachlorophenol sodium smoke when adult emergence reaches 40–50% in late June, or by spraying 1000-times dilution of diflubenzuron III in early July.
Sixth, the Liu Yu shield shield is managed by spraying 50% sputum pine oil (600–800 times) or 40% omethoate (1000 times) every 7–10 days from late June to early July, focusing on nymphs before shell formation.
Seventh, Qingyang Tiger Tianniu is controlled by spraying 50% killer pine oil (800 times) every 10–15 days from late June to July, targeting eggs and newly hatched larvae.
Eighth, Yang Gan elephants are managed by spraying 50% schisandra pine oil, 50% malathion (1000 times), or 2.5% deltamethrin EC (1000 times) depending on the infestation level, applied 1–3 times from late June to late July.
Ninth, bamboo shoot disease is addressed by spraying 50% carbendazim or 70% thiophanate-methyl (1000–1500 times) in June and July, repeated every 7–10 days up to three times.
Tenth, the peach small borer is controlled by spraying 5% yamson pine oil (1000 times) or 2.5% deltamethrin cream (2000–2500 times) on the canopy in late July.
Eleventh, the Light and Star Longhorn and Yellow Star Longhorn are managed using aluminum phosphide and zinc phosphide tablets, pills, or poison sticks placed at the base of the tree for 2–3 days. Additionally, 20–40 times dilution of 50% malathion or 40% dimethoate is injected into wormholes, and Beauveria bassiana is used for biological control.
Twelfth, loose needle disease is controlled by applying pentachlorophenol sodium smoke from late June to early July. A good application rate is 0.6–0.8 kg per canopy, with 7.5 kg per square meter. Smoke should be released on dry days, either after sunset or before sunrise, for optimal effectiveness.
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