关键词: 番茄褪绿病毒, MED烟粉虱, 寄主选择性, 取食行为, 刺吸电位

Abstract: 【Aim】 Tomato chlorosis virus (ToCV) is transmitted by whiteflies and breaks out heavily. At present, ToCV has spread to most regions of the world, and can harm a variety of crops and cause serious damage to agricultural and forestry economic production. Virus infection can influence the host preference and feeding behaviors of vector insects, thus influencing virus transmission. The aim of this study is to investigate the effects of ToCV on the host preference and feeding behaviors of Bemisia tabaci MED adults on different host plants. 【Methods】 The host selectivity of ToCV-infected and non-infected B. tabaci MED female adults was determined by Y-tube olfactometer, and the feeding behaviors between ToCV-infected and ToCV-non-infected female adults of B. tabaci MED on four healthy host plants including tomato, pepper, cotton and cowpea were compared with electrical penetration graph (EPG). 【Results】 The preference of ToCV-non-infected female adults of B. tabaci MED to tomato and pepper was the highest, that to cotton followed and that to cowpea was the least. The preference of female adults of B. tabaci MED infected by ToCV to tomato, pepper and cotton was higher than that to cowpea. The numbers of probes of the ToCV-infected female adults of B. tabaci MED on the four plants were significantly increased, their first time to probe phloem was significantly delayed, and their total feeding time and phloem feeding time significantly decreased as compared with those of the ToCV-non-infected female adults. 【Conclusion】 ToCV significantly changes the host preference and feeding behaviors of B. tabaci, thus increases the probability of its own transmission among host plants.

Key words: Tomato chlorosis virus; Bemisia tabaci MED, host preference, feeding behavior; electrical penetration graph