Search

The biological control and use of insecticides need to be compatible in order to preserve the community of insects that is beneficial for the production system. Therefore, the aim of this study was to assess the alterations of biological characteristics of Trichogramma pretiossum Riley, 1879 (Hymenoptera: Trichogrammatidae), when submitted to the parasitism of Anagasta kuehniella eggs (Zeller, 1879) (Lepidoptera: Pyralidae) treated with insecticides recommended for the tomato culture for selectivity tests. The experiment was conducted at the Nucleus for Scientific and Technological Development in Phytosanitary Management (NUDEMAFI) in climate-controlled chambers at the temperature of 15±1ºC, relative humidity of 70±10%, and photophase of 14 hours. One newly emerged T. pretiosum female was used in each Eppendorf tube containing a card with 20 unviable eggs of A. kuehniella host, which were previously emerged in insecticide syrup. Fifteen repetitions were conducted for each treatment. The eggs were submitted to parasitism for 24 hours and after the descendants emerged, the characteristics were verified for biological parasitism and development of individuals. Insecticides with active ingredients Piriproxifen, Teflubenzuron, Acetamiprid 1, Lambda- Cyalothrin and Chlorantraniliprole + Lambda-Cyalothrin were considered the most selective for parasitoid T. pretiosum.

The aim of this study was to evaluate the possible alterations of biological characteristics of Trichogramma pretiossum (Riley, 1879) (Hymenoptera: Trichogrammatidae) submitted to the parasitism of Anagasta kuehniella (Zeller, 1879) (Lepidoptera: Pyralidae) eggs treated with fungicide registered for the tomato culture in selectivity tests using the methodology suggested by the IOBC/WPRS for selectivity studies. A total of 29 fungicides were evaluated in the experiments performed at the Nucleus for Scientific and Technological Development in Phytosanitary Management (NUDEMAFI). Cards with 20 host eggs were immersed in fungicide syrup and submitted to parasitism for 24 hours. After the incubation period for the parasitoid and their emergence the fungicide effects were assessed for the biological characteristics of the parasitism. We concluded that the fungicides Supera® (COPPER HYDROXIDE 537.4g/L), Nativo® (TEBUCONAZOLE 200g/L + TRIFLOXYSTROBIN 100g/L), Censor® (FENAMIDONE 500g/L), Manzate 800® (MANCOZEB 800g/Kg), Captan SC® (CAPTAN 480g/L), Amistar 500 WG® (AZOXYSTROBIN 500g/Kg), Frowncide 500 SC® (FLUAZINAM 500g/L), Fegatex® (BENZALKONIUM CHLORIDE 100g/L), Redshield 750® (CUPROUS OXIDE 860g/Kg), Proplant® (PROPAMOCARB CHLORIDE 722g/L), Isatalonil 500 SC® (CHLOROTHALONIL 750g/Kg), Recop® (DICOPPER CHLORIDE TRIHYDROXIDE 840g/Kg), Bion 500 WG® (ACIBENZOLAR-S-METHYL 500g/Kg) and Curzate BR® (CYMOXANIL 80g/Kg + MANCOZEB 640g/Kg) presented better results for selectivity in the T. pretiosum parasitoid.