【摘要】 研究了丽蚜小蜂两个品系(分别来自英国和美国)对烟粉虱各龄若虫的寄生适宜性。结果表明,两品系都能寄生烟粉虱的各龄若虫,且在3龄若虫上的寄生率最高,英国品系为55 3%,美国品系为57 6%;1龄若虫上的寄生率最低,分别为41 2%和43 8%;寄生1龄若虫时小蜂羽化率最低,分别为79 5%和83 6%;寄生3龄若虫时羽化率最高,分别为91 3%和92 8%,品系间羽化率无差异。两品系寄生1龄粉虱时发育历期最长,分别为24 0d和23 4d;英国品系寄生3、4龄若虫时发育历期最短(18 9、19 3d),而美国品系寄生4龄若虫时历期最短(15 8d),两品系寄生4龄粉虱时发育历期差异明显。由4龄若虫寄生蛹羽化出的小蜂寿命最长,分别为4 8d和4 9d;从1龄若虫寄生蛹羽化出的小蜂寿命最短,均为2 5d。更多还原

【Abstract】 The parasitic suitability of two strains of Encarsia formosa on Bemisia tabaci was assessed in the laboratory. Results showed that both strains, introduced from UK and USA respectively, could parasitize all the instars of B. tabaci. Parasitic rates on the 3rd instar were 55.3% by the British strain and 576% by the American strain, and on the 1st instar were 412% and 438% respectively. The emergence rate of adult was also the highest (913% and 928%) in host parasitized in the 3rd instar and only 795% and 83.6% in that parasitized in the 1st instar. The developmemtal period of Encarsia that parasitized the 1st instar Bemisia nymph was the longest (British strain 240d and American strain 234d) and that parasitized the 4th instar was the shortest (British strain 189d and American strain 158d).Females emerged from the host parasitized in the 4th instar could starve the longest period (British strain 48d and Amrican strain 49d) and those parasitized in the 1st instar host starved the shortest (25d for both strains).更多还原