Toxic and sublethal effects of buprofezin on the whitefly parasitoid Encarsia formosa Gahan

  • Tanja Drobnjaković Institute of Pesticides and Environmental Protection, Banatska 31b, 11080 Belgrade
  • Dejan Marčić Institute of Pesticides and Environmental Protection, Banatska 31b, 11080 Belgrade
  • Mirjana Prijović Institute of Pesticides and Environmental Protection, Banatska 31b, 11080 Belgrade
  • Slobodan Milenković Megatrend University, Faculty of biofarming, Maršala Tita 39, 24300 Bačka Topola
Keywords: Encarsia formosa; buprofezin; sublethal effects; life history traits; population growth

Abstract


Acute toxicity of a buprofezin-based product (commercial product Elisa 440 SC) to pupae of
the whitefly parasitoid Encarsia formosa Gahan (Hymenoptera: Aphelinidae), and its effects on life
history traits and population growth in F1 generation of a commercial strain (“Dutch” strain, D)
and two local populations from Serbia (Bujanovac, B; Negotin, N) were examined in laboratory
bioassays. All trials were carried out at 27±1°C temperature and 60±10% relative humidity, and
under 16/8 h daylight/darkness photoperiod in four replications. In an acute toxicity bioassay,
tobacco leaves carrying parasitoid pupae (20 pupae per replicate) were treated with a series of
buprofezin concentrations covering a 10-90% mortality range, and mortality was calculated
based on the number of emerging adults 9 days after treatment. The following LC50 (mg/l)
estimates were obtained: 244.2, 281.5 and 199.5 (for B, N and D, respectively). The product
based on buprofezin, applied to parasitoid pupae at concentrations within the LC50s and 95%
confidence limits (264 mg/l for B and N; 220 mg/l for D), significantly prolonged the duration
of juvenile development (2, 1.7 and 2.2 days for B, N and D, respectively, compared to control
data). Females from all tested populations that emerged from the treated pupae and were
exposed to the residual action of buprofezin lived shorter than control females (B, N and D by
1.5, 0.7 and 1.7 days, respectively). Also, females that emerged from the treated pupae achieved
a significantly reduced level of parasitism (B, N and D by 11.7, 17.7 and 17.6 %, respectively), total
adult emergence (B, N and D by 11.6, 17.8 and 17.8 %, respectively) and instantaneous rate of
increase (B, N and D by 8.2, 6.8 and 12.5 %, respectively), compared to control. More precise
determination of risks involved in the use of buprofezin requires its more detailed field testing.

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doi:10.1201/9781420059762

Published
2020/05/02
Section
Original Scientific Paper