Seletividade de inseticidas, recomendados para cucurbitáceas para Trichogramma atopovirilia Oatman & Platner (Hymenoptera: Trichogrammatidae) em condições de laboratório

Abstract

Selectivity of pesticides used in cucurbits to Trichogramma atopovirilia Oatman & Platner (Hymenoptera: Trichogrammatidae)The cucurbit borers Diaphania spp. are major cucurbit pests, causing losses of up to 100% in production. Biological control with the parasitoid Trichogramma is an alternative for reducing the use of insecticides. The objective of this study was to evaluate the selectivity of the active ingredients abamectin, chlorfenapyr and thiacloprid to Trichogramma atopovirilia Oatman & Platner (Hymenoptera: Trichogrammatidae). For this purpose, 20 newly emerged females of T. atopovirilla were confined individually in glass tubes (2.5 cm diameter x 8.5 cm in length), with 30 eggs of Diaphania hyalinata (Linnaeus) (Lepidoptera: Pyralidae) glued on a small cardboard strip that was previously immersed for five seconds in chemical solution. The active ingredients abamectin, chlorfenapyr and thiacloprid did not affect the T. atopovirilia parasitism. However, chlorfenapyr reduced larval emergence. Abamectin and thiacloprid can be therefore recommended for the Integrated Pest Management, as they proved to be the most selective to T. atopovirilia in D. hyalinata eggs.

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

“…The degree of toxicity in pesticides towards non-target organisms analyzed in this type of study may be related to many factors such as the nature of the formulation and concentration of the products. Another factor that may interfere in the selectivity level is the target host, since for parasitoids of the Trichogramma genre the physical-chemical structure of the core of the egg can be extremely different, which may allow the fixation and penetration of products leading to the rejection of the host (Pratissoli et al, 2011, Oliveira, et al, 2013, Santos et al, 2016, Rodrigues et al, 2017, Deshmukh, et al, 2018, Asrar, et al, 2019, Pratissoli et. al., 2019, Parsaeyan et al, 2020.…”

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

“…presiotum) is that the physical-chemical structure of the corium of the egg can be extremely different, which may interfere in the fixation and penetration of the products (Pratissoli et al 2011, Oliveira et al 2013, Santos et al 2016Rodrigues et al 2017, Deshmukh et al 2018, Asrar, et al 2019, Pratissoli et. al.…”