Christian Sherley Araújo da Silva-Torres

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The striped mealybug, Ferrisia virgata (Hemiptera: Pseudococcidae), is a polyphagous and cosmopolitan species, which attacks a wide variety of crops, including cotton. Lately, it has been found infesting colored fiber cotton and emerging as an important pest in the Northeast of Brazil. Therefore, this study investigated the effects of colonization,(More)
The high reproduction rate, potential to cause damage, wide geographic distribution and resistance to insecticides of Plutella xylostella (L.) makes difficult its efficient control. However, larvae and pupae of this pest are naturally parasitized by Oomyzus sokolowskii (Kurdjumov), providing opportunities to improve the natural parasitism. This study(More)
The predaceous stinkbug Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) feeds on plants as well as on arthropod prey. The question arises whether feeding on plants might expose the predator to systemic insecticide via ingestion of the active ingredient or its metabolites through plant sap of treated plants. This interaction was investigated with(More)
Sap-sucking sessile insects depend on their selected host plant for their development; hence, they are influenced by the nutritional quality of the plant, especially the available nitrogen (N) and water content in the plants. The levels of N in the plant sap can vary as function of the N fertilization applied to enhance crop yield, while deficit of water(More)
Bracon vulgaris is a larval ectoparasitoid of the boll weevil, Anthonomus grandis, a key cotton pest We investigated the influence of parasitoid age, photoperiod and host availability on B. vulgaris parasitism. Five- and 10-day-old parasitoids were exposed to A. grandis densities of three, six, 12 and 24 larvae per female. Five-day-old females showed higher(More)
The ladybird beetle, Eriopis connexa (Germar) (Coleoptera: Coccinellidae), is one of the commonest predators of aphids (Hemiptera: Aphididae) in the cotton agroecosystem and in many other row and fruit crops in Brazil, and has been introduced into other countries such as the USA for purposes of aphid control. In addition, the boll weevil, Anthonomus grandis(More)
Chemical signals used by parasitoids to Þnd hosts often originate from the host, its habitat, or both, providing critical cues for locating hosts that are often cryptic or highly dispersed. MelittobiaWestwood are gregarious ectoparasitoids, which primarily attack Trypoxylon politum Say prepupae.HowMelittobia locates its host is unknown, but itmay involve(More)
We report the occurrence of natural enemies of Plutella xylostela (L.) in organically farmed kale in Pernambuco, Brazil. Seven natural enemies were observed parasitizing or preying on larvae and pupae of P. xylostella--three parasitoids: Cotesia plutellae Kurdjumov (Hym.: Braconidae), Conura pseudofulvovariegata (Becker) (Hym.: Chalcididae) and Tetrastichus(More)
Consistent data demonstrate the positive response of sap-sucking insects to water-stressed plants, but there is a lack of information about the performance of chewing species, including whether their responses vary according to their feeding specializations. We tested the hypothesis that herbivores with distinct feeding strategies and host specialization(More)
Mealybugs have strong associations with their host plants due to their limitations for dispersal. Thus, environmental conditions and host quality may impact the biological traits of mealybugs. To the best of our knowledge, we are the first to report on the biology of a Brazilian population of the striped mealybug Ferrisia virgata Cockerell (Hemiptera:(More)