Forest tree pest management in summer
In midsummer, the Shu Shu enters its active growth phase. However, this period also marks the peak activity of various pests and pathogens that threaten tree health, causing significant damage. To manage these threats effectively, several control methods are commonly used:
First, for pine caterpillars, a 25% malathion, 25% dimethoate, or 25% phoxim solution diluted 2500–3000 times is applied during the 6th instar stage in July to suppress their population.
Second, for the American white moth, a spray containing 25% diflubenzuron and 40 ppm trichlorfon, diluted 1000 times, is used from late June to early July to target 1st to 3rd instar larvae.
Third, for the big bag moth, spraying with 90% trichlorfon crystals (1000–1500 times) or 2.5% deltamethrin EC (5000–10000 times) is effective during the hatching periods in mid-July and late October. Alternatively, during late July to early August, drill three holes into the trunk of dead trees and inject 50% monocrotophos EC or 80% Phosphine EC at 20–40 times 3–5 ml per hole, then seal the holes with mud.
Fourth, for the indigo leaf beetle, burning or spraying 2.5% deltamethrin emulsion (8000–10000 times) and 40% omethoate (2000 times) is recommended in early July when pupae cluster on the trunk.
Fifth, for the larch sheath moth, when adult emergence reaches 40–50% in late June and 70% in early July, applying pentachlorophenol sodium smoke once helps kill adults. In early July, a 1000-times dilution of diflubenzuron III can be sprayed on eggs.
Sixth, for Liu Yu shield scale, during the nymph incubation period from late June to early July, spraying 50% sputum pine oil (600–800 times) or 40% omethoate (1000 times) every 7–10 days is effective. It's important to apply before the shell forms, as it becomes harder to penetrate afterward.
Seventh, for Qingyang Tiger Tianniu, spraying 50% killer pine oil (800 times) on branches every 10–15 days from late June to July helps control eggs and newly hatched larvae.
Eighth, for Yang Gan elephants, spraying 50% schisandra pine oil, 50% malathion (1000 times), or 2.5% deltamethrin EC (1000 times) during the adult emergence period from late June to late July is recommended, typically applied 1–3 times depending on infestation levels.
Ninth, for bamboo shoot disease, spraying 50% carbendazim or 70% thiophanate-methyl (1000–1500 times) on Nanzhu shoots in June and July, repeated every 7–10 days, can help prevent infection.
Tenth, for the peach small borer, spraying 5% yamson pine oil (1000 times) or 2.5% deltamethrin cream (2000–2500 times) on the canopy in late July is advised.
Eleventh, for light and star longhorn beetles, using aluminum phosphide or zinc phosphide tablets, pills, or poison sticks placed at the base of the trunk for 2–3 days, along with 50% malathion or 40% dimethoate (20–40 times) injected into wormholes, or Beauveria bassiana treatment, is an effective strategy.
Twelfth, for loose needle disease, applying pentachlorophenol sodium smoke from late June to early July is recommended. A dosage of 7.5 kg per square centimeter is ideal, and it should be released on a dry day after sunset or before sunrise for best results.
These methods offer a comprehensive approach to pest and disease management during the critical midsummer period, ensuring the health and vitality of the Shu Shu trees.
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