Asian varieties of chestnut

The parasitoid was also introduced to Hungary and Croatia in and Slovenia in Radocz et al. Even on good sites, the best results were obtained by girdling the present forest growth and allowing the chestnuts to grow up with protection of these girdled trees with less deterioration of site than is usual with clear-cutting. Perhaps this species may do better as a forest tree in the United States than in China. Sometimes the cankered area is swollen, and sometimes it is sunken page 6 ; but slicing away the bark will always disclose the fungus fans if the blight is the primary cause of the canker. Trapa rosette showing nuts and inflated leaf petioles Each rosette is capable of producing up to 20 hard, nut-like fruits.
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Water Chestnut

Their weapon in their conservation efforts are strains of weakened hypovirulent fungus. However, they in turn are usually killed before they reach a height of 6 m. Control with fungicides is difficult, however the use of trunk injections or foliar sprays with phosphorous acid as a preventative for healthy trees is currently under trial evaluation and showing promising results. This is a nut-producing tree, yielding nuts for human and wildlife consumption. In addition, chemical treatments are often impractical due to the natural distribution of chestnut trees on steep terrain Germinara et al. The blight has not been reported on this species in China, and in the United States the species is very resistant to the disease.
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Chinese Chestnut Tree on the Tree Guide at

Infestation has stayed low since in Japan. Hypovirulence is a type of biocontrol which slows down and weakens disease progress Griffin WWW. Chemical control: The use of chemicals against the immature stages is inefficient because of the cryptic nature of the insect living in dormant buds for the majority of its life; the larva is protected within the plant tissues Moriya et al. Absence of data does not necessarily mean absence of the species at that site, but that it has not been reported there. Stems can reach lengths of up to 16 feet 4. On examination of such a limb, a girdling blight canker will be found.
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Classical biological control: To date, the most effective method to control the Asian chestnut gall wasp is the introduction of the parasitoid Torymus sinensis Kamijo Hymenoptera: Torymidae. Anyone attempting eradication, even on a less susceptible species like the European chestnut, must take extreme precautions. Pupa of Dryocosmus kuriphilus. At the beginning of this century France, for example, grew nearly , t of chestnuts, alone. Species: Worldwide there are four main species along with several minor species. Identification and Biology.
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