桔小实蝇对石榴的产卵偏好性研究

明确石榴品种、成熟度以及果实的完整性对桔小实蝇产卵偏好的影响，可为石榴园桔小实蝇的行为调控提供重要理论依据。本研究以采自四川省会理市彰冠镇不同品种、不同成熟度石榴果实作为材料，通过选择性试验，统计果实上的产卵孔数和着卵量，分析桔小实蝇的产卵选择行为。研究结果显示，桔小实蝇对不同品种石榴的产卵偏好性为软籽石榴＞硬籽石榴＞野生硬籽石榴；对不同成熟度石榴的产卵偏好性为熟果＞完熟果＞生果；石榴裂果比正常果更吸引桔小实蝇产卵。相关性分析结果表明，在石榴正常果状态下，软籽石榴和野生硬籽石榴的可溶性固形物含量与产卵孔数、着卵量均呈显著正相关性，而硬籽石榴可溶性固形物含量与产卵孔数、着卵量均无显著相关性；在石榴裂果状态下，各石榴品种可溶性固形物含量和着卵量均无显著相关性。桔小实蝇更偏好于软籽石榴熟果、裂果以及可溶性固形物含量为14.00%~17.00%的果实上产卵，会理地区8-9月时石榴的生长处于熟果期且多裂果，因此该时期应为桔小实蝇发生为害的关键时期，要提前做好防控。

Oviposition preference of the oriental fruit fly Bactrocera dorsalis on pomegranate

To clarify the effects of pomegranate variety, maturity and fruit integrity on Bactrocera dorsalis oviposition preference, and provide an important theoretical basis for the behavioral regulation of B.dorsalis in pomegranate garden. In this study, pomegranate fruits of different varieties and different maturities collected from Zhangguan Town, capital city, Sichuan Province were used as materials. Through selective experiment, the number of oviposition apertures and the number of eggs on the fruit were counted, and the oviposition selection behavior of fruit fly B.dorsalis was analyzed. The results showed that the oviposition preference of citrus fruit fly to different varieties of pomegranate was soft seed pomegranate>hard seed pomegranate>wild hard seed pomegranate. The oviposition preference of pomegranate with different maturity was ripe fruit>fully ripe fruit>unripe fruit. Compared with the intact fruit, cracked fruits were more preferred for oviposition by B.dorsalis. The results of correlation analysis showed that under the normal fruit state of pomegranate, the soluble solid content of soft seed pomegranate and wild hard seed pomegranate had a significant positive correlation with the number of oviposition apertures and the amount of eggs, while the soluble solid content of hard seed pomegranate had no significant correlation with the number of oviposition apertures and the number of eggs. Under the condition of pomegranate in cracked fruit, there was no significant correlation between soluble solid content and the number of eggs of each pomegranate variety. B.dorsalis prefers ripe fruit, cracked fruit and fruit with soluble solid content of 14.00%~17.00% of soft seed pomegranate to lay eggs. From August to September in Huili area, pomegranate growth is in ripe fruit stage and many cracked fruits.Thus, this period should be the key period for the damage of B.dorsalis, and prevention and control should be done in advance.