6种寄主对异迟眼蕈蚊生长发育和繁殖力的影响

Effects of six Hosts on the Development and Fecundity of Bradysia difformis Frey

异迟眼蕈蚊是一种多食性害虫,寄主众多.为了解不同寄主对其生长发育和繁殖力的影响,在温度(25±1)℃,相对湿度70%±10%,光照16 L∶8 D条件下,测定了6种寄主对异迟眼蕈蚊的发育历期、幼虫存活率、成虫寿命和产卵量的影响.结果表明:异迟眼蕈蚊发育历期在平菇和香菇上相对较短,分别为21.25 d和21.68 d,显著短于其他4种寄主(F=16.85,p<0.05);幼虫存活率和总成活率以香菇最高,分别为70.86%和37.83%;4龄幼虫体质量在平菇和香菇上相对较重,分别为2.53 mg和2.48 mg;成虫寿命和产卵期以平菇和香菇上相对较长;单雌产卵量以平菇和香菇相对较高,分别为106.43粒和98.14粒.表明异迟眼蕈蚊在平菇和香菇上的适应性较好,两种寄主对其个体发育和种群繁殖有利.

Bradysia difformis is a polytrophic pest,it damages to variety of hosts.In order to explore the influence of different host on the development and fecundity of B.difformis,the effects of six hosts on the developmental duration,larval survival,adult longevity and the amount of eggs were carried out under laboratory conditions(25±1)℃,RH 70%±10%,and a photoperiod of 16 L∶8 D.The results showed that developmental duration of B.difformis was relatively short on Pleurotus ostreatus and Lentinus edodes,which were 21.25 d and 21.68 d,respectively,They were significantly shorter than the other four hosts(F=16.85,p<0.05).Larval survival and the total survival rate were highest on L.edodes,which were 70.86%and 37.83%,respectively,body weight of 4th instar larvae were relatively heavy on P.ostreatus and L.edodes,which were 2.53 mg and 2.48 mg,respectively.Adult longevity and spawning period were longer on P.ostreatus and L.edodes,and the number of eggs laid per female were higher on P.ostreatus and L.edodes,which were 106.43 and 98.14 respectively.These results indicated that this pest had a good adaptability on P.ostreatus and L.edodes,and two hosts were beneficial to development and population reproduction of B.difformis.