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journal1 ›› 2018, Vol. 34 ›› Issue (2): 198-203.DOI: 10.16409/j.cnki.2095-039x.2018.02.003

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Adaptability of Encarisa formosa to Trialeurodes vaporariorum Reared on Yacon and Tobacco

ZHAO Yue, DAI Peng, ZANG Liansheng, RUAN Changchun   

  1. Engineering Research Center of Natural Enemy Insects/Institute of Biological Control, Jilin Agricultural University, Changchun 130118, China
  • Received:2017-11-24 Online:2018-04-08 Published:2018-04-13

Abstract: Yacon (Smallanthus sonchifolius) and tobacco (Nicotiana tabacum L.) are two plant species with large leaves and are suitable host plants for Trialeurodes vaporariorum Westwood. To determine the feasibility of yacon as intermediate host plant for mass rearing Encarsia formosa Gahan, the parasitism, emergence and development of E. formosa on T. vaporariorum nymphs reared by yacon and tobacco were comparatively investigated in the laboratory. The results showed that parasitism of E. formosa was the highest in the 3rd-instar nymphs of T. vaporariorum reared on yacon (84.2%) and tobacco (80.3%). The parasitism rate of the 1st, 2nd-instar nymphs on yacon by E. formosa were significantly higher than those on tobacco. There was no significantly difference in emergence of E. formosa on all stage nymphs reared by yacon and tobacco with an exception for the 1st-instar nymph, and E. formosa had the highest emergence on the 3rd-instar nymphs reared on yacon (94.7%) and tobacco (93.8%). The developmental time of E. formosa parasitizing the 1st, 2nd, 3rd, 4th-instar nymphs on yacon were 21.4, 15.5, 13.7, 13.3 d, respectively; except for 1st-instar, the developmental time were significantly shorter than those on tobacco. Generally, E. formosa had higher adaptability to T. vaporariorum nymphs reared on yacon than those on tobacco. Particularly, E. formosa exhibited the highest performance on the 3rd-instar nymphs. These results provide a theoretical basis for further utilizing yacon as host plant in mass rearing E. formosa.

Key words: Encarisa formosa, yacon, tobacco, Trialeurodes vaporariorum, mass production

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