1、山東農(nóng)業(yè)大學(xué)碩士學(xué)位論文三種果樹(shù)食心蟲(chóng)發(fā)生為害和梨小食心蟲(chóng)耐寒性研究姓名：凌飛申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：農(nóng)業(yè)昆蟲(chóng)與害蟲(chóng)防治指導(dǎo)教師：墨鐵路;許永玉2011-06-15三種果樹(shù)食心蟲(chóng)發(fā)生為害和梨小食心蟲(chóng)耐寒性研究 2 Abstract 1 Studies on the occurrence dynamic, damage of fruit borer in Feicheng monoculture peach orchard and pol

2、yculture peach orchard of Taian The population danamics and damages of the fruit borer insect pests were investigated in monoculture peach orchard and polyculture peach orchard of Feicheng and Taian district in Shan

3、dong Province. The results showed that the three main borer insect pests, Carposina sasakii (Matsmura), Dichocrocis punctiferalis (Guenee) and Grapholita molesta (Busck) in monoculture peach orchard had two, three, and f

4、ive generations in 2009, respectively, and two, three, and four generations in 2010, respectively. The percentages of shoot tip damage in young and old peach orchard were different, but there was no significant differenc

5、e between them. In polyculture peach orchard, in 2009 and 2010, C. sasakii (Matsmura), D. punctiferalis (Guenee) and G. molesta (Busck) had two, three, and five generations in each year, respectively. The percentage of s

6、hoot tip damage in May was lower than June and July. All of the borers had the phenomenon of generation overlapping in monoculture peach orchard and polyculture peach orchard, and G. molesta (Busck) had the largest popu

7、lation and made the most serious damage to the Feicheng peach productions. 2 Seasonal variation in cold tolerance of the Grapholita molesta (Busck) (Lepidoptera: Tortricidae) larvae In this study, seasonal variation in

8、 cold tolerance of G. Molesta (Busck) were investigated by measuring their super-cooling point (SCP), water content, total lipid content and cold survival ability. Results showed that cold tolerance of the larvae varied

9、obviously with seasons. The pre-winter larvae had higher tolerance to low temperature than the summer larvae. The SCP, the water, protein and glycogen content of the larvae varied remarkably in different seasons. The SCP

10、 of the larvae were lowest in January(–25.66and ℃ –19.92 , ℃respectively) while highest in July (–15.91℃ and –11.97 , respectively) ℃ ; the water, the protein and the glycogen contents of larvae were highest in July(70

11、.62%, 158μg/mg, 26.29μg/mg, respectively), while lowest in January(55.20%, 62μg/mg, 9.32μg/mg), and then increased after winter. The lipid contents of the larvae were 9.34%(July)；then increased to 33.35% ( October ), and