Impacts of seven insecticides on Cotesia flavipes (Cameron) (Hymenoptera: Braconidae)

• Published in: Ecotoxicology (London) Vol. 28; no. 10; pp. 1210 - 1219
• Main Authors: Fagundes Matioli, Thaís, Zanuzo Zanardi, Odimar, Takao Yamamoto, Pedro
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-12-2019; Springer; Springer Nature B.V
• Subjects: Animals; Borers; Boring organisms; Braconidae; Brazil; Control; Cotesia flavipes; Cyhalothrin; Distilled water; Earth and Environmental Science; Ecology; Ecotoxicology; Environment; Environmental Management; Female; Females; Host-Parasite Interactions; Hymenoptera; Insect Control; Insecticides; Insecticides - toxicity; Larvae; Leaves; Mortality; Moths - parasitology; Offspring; Parasitoids; Pest Control, Biological; Pests; Progeny; Spraying; Sublethal effects; Sugarcane; Tebufenozide; Thiamethoxam; Tibia; Triflumuron; Wasps; Wasps - anatomy & histology; Wasps - drug effects; Wasps - physiology; Brazil; Toxicity; Integrated pest management; Larval parasitoid; Transgenerational sublethal effects; Diatraea saccharalis
• ISSN: 0963-9292; 1573-3017
• DOI: 10.1007/s10646-019-02129-8

The endoparasitoid wasp
Cotesia flavipes
(Cameron) (Hymenoptera: Braconidae) is inundatively released in Brazilian sugarcane plantations to control the sugarcane borers
Diatraea saccharalis
(Fabricius) and
Diatraea flavipennella
(Box) (Lepidoptera: Crambidae). In conjunction with these releases, several synthetic insecticides are used to control the neonate larvae of these pests. We assessed the lethal and transgenerational sublethal effects of seven of these insecticides on
C. flavipes
. Leaf discs were sprayed at the highest field concentrations of chlorantraniliprole, lambda-cyhalothrin + chlorantraniliprole, chlorfluazuron, triflumuron, lambda-cyhalothrin + thiamethoxam, tebufenozide, and novaluron. Distilled water was used as a negative control. Newly emerged females (24 h old) were placed in Petri dishes containing the treated leaves, and the lethal and transgenerational sublethal effects were assessed for the next two generations. Lambda-cyhalothrin + chlorantraniliprole and lambda-cyhalothrin + thiamethoxam caused 100% mortality of the parasitoid and were highly persistent, causing more than 30% mortality at 30 days after spraying. Chlorantraniliprole, chlorfluazuron, novaluron, and triflumuron did not cause significant mortality compared to the negative control, but did have transgenerational sublethal effects. The length of the tibia of the right posterior leg, used as a growth measurement, was reduced in the progeny (F
1
generation) of exposed female parasitoids. In addition, chlorantraniliprole increased and chlorfluazuron reduced the proportion of females in the F
1
generation, whereas novaluron reduced the proportion of females in the F
2
generation. Overall, only tebufenozide was considered harmless to
C. flavipes
. The results of this study suggest that lambda-cyhalothrin + chlorantraniliprole and lambda-cyhalothrin + thiamethoxam are harmful to
C. flavipes
, although field studies are needed to obtain results for actual sugarcane crops.