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Study on the Spore Formation and Release Pattern of Valsa Ceratosperma, and the Lesion Expansion Dynamics of Apple Tree Canker

Author: ChenQu
Tutor: CaoKeQiang；WangShuTong
School: Agricultural University of Hebei
Course: Plant Pathology
Keywords: Apple canker Lesion extension Pycnidium Conidia
CLC: S436.611
Type: Master's thesis
Year: 2011
Downloads: 75
Quote: 1
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Abstract


Apple rot disease (Valsa ceratosperma (Tode et Fr.) Marie) is an important disease in apple production in China , the disease have occurred in most of our apple production , resulting in dead trees and destroyed park , a serious threat to the health of the apple industry development. The expansion of the disease lesion anniversary conidia formation and release pattern helps to clarify the law of the occurrence of the disease is important for the development of targeted prevention measures . Through field and laboratory experiments in this study , apple canker lesion expansion changes conidia production and release of law system , the key findings are as follows : 1 . Apple tree canker lesion anniversary can be expansion , in different seasons , spring lesion extension fastest, accounting for 68.2% of the annual amount of lesion extension , autumn and summer for a smooth extension period , the amount of expansion accounted for 13.4% and 12.1 % of the annual amount of expansion , winter lesion expansion is relatively slow but not stopped , an expansion of 6.3% of the total annual amount of expansion . In the field about a month after vaccination conidia can be formed . Which spring conidia formation fastest 21 d can be formed conidia is visible to the naked eye . In the summer , fall and winter , conidia formation time were 35 d , 29 d and 61 d . Apple canker pycnidium anniversary visible conidia , and mature in 70 to 90% . Different periods in the year . 3 can be to produce conidia angle . Rainfall and humidity are the main factors affecting the apple canker conidia release and the formation of conidia angle , temperature is not the main factors . 4 . Indoor test results show that , Valsa mali tested six medium fruiting body 's ability differences . Which ABA mature rate of fruiting bodies and produce a large number of spores , fruiting body maturation rate on PDA after the ABA . Black light irradiation , the culture of the apple trees in the ABA rot bacteria produce conidia maximum volume , the formation time shortest, highest maturation rate conidia content .

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CLC: > Agricultural Sciences > Plant Protection > Pest and Disease Control > Horticultural Crops Pest and Disease Control > Fruit tree pests and diseases > Pome pests and diseases > Apple pests and diseases
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