Toxicidad de spiromesifen en los estados biológicos de Bactericera cockerelli (Sulc) (Hemiptera: Triozidae)

Abstract

-Spiromesifen is an insecticide that inhibits the synthesis of lipids and, in Mexico, its use against the Tomato-Potato Psyllid, Bactericera cockerelli (Sulc), on chili pepper (Capsicum annum), tomato (Lycopersicon sculentum) and potato (Solanum tuberosum) began in 2005; however more information is needed to understand its toxicity on this insect pest. The aim of this research was to determine the toxicity of spiromesifen against each of the biological stages of tomato-potato psyllid, its effect on fertility and viability of eggs deposited by treated females, as well as the female preference to lay eggs on treated and non treated plants. The relative toxicity at 95% mortality (highest LC 95 value /LC 95 value of the respective biological stage) of spiromesifen in egg, nymph 1, nymph 2, nymph 3, nymph 4, and nymph 5 were 517.5; 31316.2; 2950.1; 315.6; 18.2 and 1-fold, respectively. There were no differences in the toxicity of spiromesifen between adult males and females. The number of laid eggs was reduced as the spiromesifen concentration used to treat female increased and egg hatch was reduced in all tested doses. In the "no choice" test, females deposited 38.6 ± 2.01 eggs by leaf of non treated chili pepper type jalapeño, while in the treated with 360 mg L -1 we observed 0.3 ± 0.08 eggs by leaf. In the "choice" test, the oviposition decreased as the dose increased. There were no eggs on plants treated with 2400 mg L -1 of spiromesifen.

Efficacy of insecticides against the tomato/potato psyllid (<i>Bactericera cockerelli</i>)

“…Effective control of pear psyllids (Psylla pyri) using spirotetramat has also been reported (Brück et al 2009). Previous studies have also shown spiromesifen to give good control of TPP (Berry et al 2009;Tucuch-Haas et al 2010). Buprofezin + oil and the mineral oil treatment controlled TPP nymphs for up to 2 weeks after treatment.…”

Control alternativo de Aethina tumida Murray (Coleoptera: Nitidulidae) con polvos vegetales

“…Para tal propósito, se emplearon cajas Petri de plástico (4 cm de diámetro), con ventilación, donde se introdujeron 10 escarabajos (previamente anestesiados con CO 2 a 30 psi durante un minuto para facilitar su manipulación), a los que se les aplicó el polvo vegetal en la dosis correspondiente sobre el cuerpo del insecto (la cantidad aplicada se dejó en la caja Petri para el libre contacto polvo-insecto). Se consideró muerto aquel individuo que no moviera las antenas, que no caminara o no respondiera al toque del pincel (Tucuch-Haas et al 2010). El máximo nivel de mortalidad aceptable para el testigo sin tratar fue 20% y se corrigió mediante la fórmula de Abbott (Abbott 1925).…”

Identificación del insecto agallador (Trioza rusellae Tuthill) en hojas de Brosimum alicastrum Swartz en Yucatán, México

“…alicastrum branches were placed in entomological wooden cages with organza fabric (1 m x 1 m base x 1.5 m high) to 25 ± 3 °C for 10 days, according to the statements of Tucuch-Haas et al (2010). Adult insects were collected with a manual vacuum, while galls were dissected to collect the nymphs directly with a brush (0001).…”