Ginkgo biloba, commonly known as the ginkgo tree, has white seeds called "ginkgo nuts" that are used in traditional medicine. These seeds are believed to nourish the yin and kidney, help with coughs and asthma, and even have insect-repelling properties. However, ginkgo trees are susceptible to various diseases and pests, including stalk rot, mildew, leaf blight, dry blight, ginkgo large silk moth, peach aphid, leafworm, ginkgo leaf roller moth, cardamom, and tea-yam.
Stalk rot is a serious disease that mainly affects 1-2 year old seedlings. It thrives in high temperatures, which weaken the seedlings' resistance and allow bacteria to infect through wounds. Poorly drained nurseries and weak seedlings increase the risk of infection. The disease is most active between June and August.
To prevent stalk rot, it's recommended to sow early so seedlings can lignify before hot weather sets in. Nursery soil should be disinfected, and shade and irrigation should be managed properly. In the early stages of infection, a 50% thiophanate-methyl solution diluted 1000 times can be applied for prevention and treatment.
Mildew disease affects stored ginkgo seeds, especially at around 20°C with high humidity. Seeds that are immature or damaged are more prone to infection. To prevent this, ensure seeds are fully matured before harvesting and avoid damaging the seed coat. Dry the seeds thoroughly before storage, keep them in a cool, well-ventilated area, and consider soaking them in a 0.5% potassium permanganate solution for 30 minutes or using 10% formaldehyde diluted to 40% for disinfection.
Leaf blight is caused by pathogens that overwinter on deciduous trees. Spores form in March and infect new leaves, typically affecting young seedlings in early June and older trees in August and September. Proper management, such as removing fallen leaves and applying balanced fertilizers, helps reduce the spread. A 40% carbendazim solution diluted 500 times is effective when applied in early July. Adding 0.5% potassium dihydrogen phosphate and 0.2% urea during spraying can further enhance plant resistance.
Disenia, also known as bacterial canker, occurs when bacteria enter through wounds in the trunk or branches, causing irregular lesions. Spread occurs via wind, rain, insects, and birds. New infections appear from May onward, with the peak occurring between July and September. Preventive measures include protecting trees from injury, maintaining tree vigor, and promptly removing and burning severely infected branches. Scraping the affected areas with 10% alkaline water can significantly improve outcomes.
The ginkgo large silk moth has one generation per year. The larvae feed on leaves, starting with small amounts and increasing consumption as they grow. By the fifth instar, they can defoliate entire trees. Black light traps are effective for capturing adults from August to September. Removing clustered leaves before the third instar and spraying 2% deltamethrin 2500 times or 90% dipterex 1500–2000 times in the early larval stage can control infestations.
Taoyuan, or the ginkgo fruit borer, completes one life cycle annually. The larvae bore into the seeds, consuming them entirely. To manage this pest, spray 80% dichlorvos 1000 times when the first adult emerges. A second spray of 40% Caesaresporum 1000 times after 7 days can kill newly hatched eggs and larvae.
Dead leafworms feed on ginkgo fruits, causing them to drop within 3–10 days. Eggs are laid on host plants like Tongcao and Mahonia, and larvae burrow into the soil after maturing. Eradicating these host plants around ginkgo trees is essential. Spraying 50% trichlorfon 500 times from early May to mid-June, repeated after 10 days, is effective, especially when done in the evening.
Ochreophagus thrips, both adults and nymphs, feed on leaves, causing rapid leaf damage and defoliation. They thrive in dry conditions and move from seedlings to larger trees as temperatures rise. Spraying 80% dichlorvos 1000 times during June to August, even twice if needed, provides good control.
The ginkgo ultra-small roller leaf moth damages new shoots, leading to branch dieback and fruit drop. Infestations are more common near forest edges and decrease with higher altitude and latitude. Adults can be controlled with 2.5% deltamethrin 2500 times before emergence, while larval damage can be treated with 80% dichlorvos EC 800 times.
Soybean meal, or the ginkgo seed borer, causes significant damage by feeding inside the seeds. Larvae drill into the soil, making their occurrence dependent on soil moisture and texture. To reduce infestations, avoid planting other legumes nearby. Spraying 50% dichlorvos or 90% trichlorfon 800 times during the adult stage, with a second application after 10 days, is an effective strategy.
Proper monitoring, timely intervention, and integrated pest management are crucial for maintaining healthy ginkgo trees and ensuring high-quality seed production.
Frozen Teriyaki Fish Fillet
Teriyaki Fish Fillet Seafood,Seafood Teriyaki Fish Fillet,Delicious Teriyaki Fish Fillet
Zhoushan Banddfoods Co., Ltd. , https://www.bandd-food.com