Variation in the host preferences and responses of Ascia monuste orseis Godart (Lepidoptera: Pieridae) to cultivars of collard greens Brassica oleracea (L.) var. acephala

Abstract

This work evaluated the preference of Ascia monuste orseis among 29 cultivars of collard greens through free-and no-choice assays using female adults (attractiveness and oviposition) and third-instar larvae (feeding preference), in both laboratory and greenhouse conditions. In free-choice tests with female adults, the L, V, Y, H, A, and Z cultivars produced oviposition nonpreference in butterflies. Cultivars R, P, C, and D produced feeding non-preference in third-instar larvae of A. monuste orseis in free-and no-choice tests. Our findings may be useful for genetic improvement focusing on the development of B. oleracea var. acephala cultivars resistant to A. monuste orseis.

Antixenosis of bean genotypes to Chrysodeixis includens (Lepidoptera: Noctuidae)

“…Once larvae reached the third instar, they were subjected to a 12-hour-fast before the installation of the assay. Third-instar larvae were chosen for being less sensitive than first-and second-instar ones, and also for consuming significant amount of leaf area (Schlick- Souza et al, 2011). The number of larvae in the leaf disks of each genotype was counted at 15, 30, and 60 min, at 2, 3, 6 and 12 hours after release.…”

Resistance of sugarcane cultivars to Mahanarva fimbriolata

“…Although both tests were conducted in laboratory conditions, where temperature, air relative humidity and photoperiod should be constant, the same behavior in both tests was observed just in RB867515. Schlick-Souza et al (2011) related that a less attractive host in a free-choice test would prove susceptible in a no-choice test, as occurred with RB855156 and RB855453, in the present study. The opposite is less common, but it may also occur.…”

Atratividade de genótipos de feijão-caupi para oviposição de Bemisia tabaci biótipo B

“…O índice varia de +100 (muito estimulante) até -100 (total deterrência), e o valor 0 indica neutralidade. A classificação foi feita a partir da comparação das médias de ovos dos tratamentos com a média do tratamento-padrão, tendo-se levado em consideração o erro-padrão da média (Fenemore, 1980;Baldin et al, 2005;Schilick-Souza et al, 2011).…”