Desempenho de Trichogramma pretiosum Riley, 1879 (Hymenoptera: Trichogrammatidae), submetido a inseticidas e fungicidas em dois hospedeiros

Abstract

RESUMO Este trabalho teve como objetivo avaliar a influência de diferentes inseticidas e fungicidas, sobre Trichogramma pretiosum Riley, 1879 (Hymenoptera: Trichogrammatidae), em diferentes hospedeiros. Os testes foram realizados com adultos de T. pretiosum nos hospedeiros Anagasta kuehniella (Zeller, 1879) (Lepidoptera: Pyralidae) e Helicoverpa zea (Boddie, 1850) (Lepidoptera: Noctuidae). Os resultados mostraram que os agrotóxicos estudados tiveram efeitos diferentes sobre T. pretiosum, em função do hospedeiro. Os inseticidas IMIDACLORIPRIDO + BETA-CIFLUTRINA e METHOMYL foram os mais agressivos, reduzindo o parasitismo dos adultos de T. pretiosum em ambos os hospedeiros, enquanto, para os fungicidas, DIMETOMORPH + MANCOZEB e MANCOZEB foram os mais influentes. Diante dos resultados, conclui-se que o hospedeiro pode influenciar na ação seletiva dos inseticidas e fungicidas sobre parasitoides do gênero Trichogramma, visto que T. pretiosum foi mais susceptível ao inseticida METHOMYL e ao ACIBENZOLAR-S-METHYL, quando criado em A. kuehniella, e ao fungicida DIMETOMORPH + MANCOZEB, quando criado em H. zea. Não houve reduções expressivas dos percentuais de emergência dos descendentes, quando os fungicidas foram aplicados.

SELECTIVITY OF REGISTERED AGROCHEMICALS FOR SOYBEANS AIMING IMMATURE PHASES OF Trichogramma pretiosum

“…Stefanello Júnior (2010) working with immature stages of T. pretiosum in maize culture observed that for the pyrethroid insecticide Turbo, the pupa phase was the most affected by the insecticide action corroborating the results contained in it and also conferred class 1, for this insecticide. Santos et al (2016) also revealed greater aggressiveness of beta-cyfluthrin against T. pretiosum.…”

Compatibility between Entomopathogenic Fungi and Egg Parasitoids (Trichogrammatidae): A Laboratory Study for Their Combined Use to Control Duponchelia fovealis

“…Previous research has shown that confirmed fungus-related mortality depends on the virulence of fungal strains, EF species, Trichogramma species, and the application period (pre- or post-parasitism) [ 22 , 27 , 39 ]. Furthermore, the interactions between the EF and Trichogramma species were minimal for all biological parameters considered in this study, especially when compared with chemical insecticides [ 11 , 43 , 44 , 45 ].…”

Action of fungicide recommended for the tomato culture on Trichogramma pretiosum Riley, 1879 (Hymenoptera: Trichogrammatidae)

“…Biological and chemical controls need to be compatible in order to preserve the community of beneficial insects in the production system. Therefore, the work group of the International Organization for Biological Control of Noxious Animals and Plants (IOBC), West Palearctic Regional Section (WPRS) established the guidelines to conduct assays and categorization of pesticides according to their selectivity, including laboratory steps (adult and immature phases) (Hassan et al, 2000, Santos et al, 2016.…”

“…Parasitoids from the Trichogramma genre are being used in commercial scale and allowing the optimization in the control of lepidopteros-pest in the tomato culture (Carvalho et al, 2003). This association may reduce the number of pesticide applications, with increased economic benefits and decrease impact on the environment (Santos et al, 2016, Pratissoli et al, 2019.…”

“…Besides the direct influence on pests' eggs, the syrup containing fungicides may alter the behavior of the parasitoid such as rejecting the host, leading to parasitism not reach the desired levels (Santos et al, 2016, Rodrigues et al, 2017. So biological and chemical controls can be compatible, this study aimed to assess biological characteristics of Trichograma pretiosum Riley, 1879 (Hymenoptera: Trichogrammatidae) when submitted to parasitism in eggs treated with fungicide, as well as classify the pesticide due to their impact on natural enemies according to IOBC/WPRS classification.…”