The effects of thiamethoxam on coffee seedling morphophysiology and Neotropical leaf miner ( Leucoptera coffeella ) infestations

Autor: Suzany A Leite, Raul Narciso C Guedes, Daniela R Costa, Yelitza C Colmenarez, Sylvana N Matsumoto, Mateus P Santos, Beatriz S Coelho, Aldenise A Moreira, Maria A Castellani
Rok vydání: 2022
Předmět:
Zdroj: Pest Management Science. 78:2581-2587
ISSN: 1526-4998
1526-498X
Popis: Coffee (Coffea arabica L.) is one of the main commodities produced in Brazil. Insecticides like the (systemic) neonicotinoid thiamethoxam are widely used to suppress pest populations during coffee production, in particular the Neotropical leaf miner (Leucoptera coffeella Guérin-MènevillePerrottet, 1842) (Lepidoptera: Lyonetiidae). In addition to its efficacy against this pest species, thiamethoxam is also thought to be a bioactivator of plant metabolism, but has not yet been tested for such activity. Thus, the objectives of the present study were (1) to assess the concentration-response effects of thiamethoxam on the vegetative vigor of coffee seedlings (C. arabica 'Catuaí 144' cultivar) at different concentrations [2, 20, 40, 80 and 200 mg active ingredient (a.i.) kgThe results indicated that thiamethoxam has a deleterious effect on the morphophysiological traits of the plants compromising their development with increase in concentrations. However, leaf area exhibited a different pattern with a peak at 50 mg a.i. kgThiamethoxan exhibited bioactivation effect on leaf at low concentration, but without compromising efficacy against leaf miner populations. Therefore, its proposed metabolism-boosting properties may encourage the unnecessary use of this insecticide, potentially leading to higher selection for insecticide resistance and an eventual decline in its effectiveness against the Neotropical leaf miner. © 2022 Society of Chemical Industry.
Databáze: OpenAIRE
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