ResumoExtratos vegetais foram estudados com o objetivo de avaliar suas eficiências no controle de Rhipicephalus (Boophilus) microplus (Canestrini, 1887) AbstractPlant extracts were studied to evaluate its efficiency in the control of Rhipicephalus (Boophilus) microplus (Canestrini, 1887) in laboratory. Engorged female ticks were collected from the cattle, kept in Petri dishes. Organic alcoholic extracts 2% (weight/volume) were used: seeds of Annona muricata L. (Annonaceae) (soursop); flowers of Syzygium malaccensis (L.) (Myrtaceae) (iamb), leaves of Cymbopogon citratus (DC.) Stapf (Poaceae) (holy grass), leaves of Azadirachta indica A. Juss (Meliaceae) (neem) and hexane extract 2% (weight/volume) of A. indica (seeds). The control groups consisted of untreated females and females treated with distilled water and sterile and dimethylsulfoxide (DMSO) a concentration of 1%. The extract of A. muricata (seed) had the highest mortality with acaricide activity and 100% efficacy followed by extracts of S. malaccensis (75 and 59.24%) and A. indica (65 and 38.49%). The seed extract of A. muricata reduced 100% larvae hatch.

ABSTRACT. The sugarcane borer Diatraea flavipennella (Box.) (Lepidoptera: Crambidae), has ultimately predominated in the sugarcane fields of the Brazilian northeast region, despite the continual release of the parasitoid Cotesia flavipes (Cam.) (Hymenoptera: Braconidae). Questions have been raised about the efficiency of Diatraea spp. in controlling D. flavipennella. In this study, females reared in one of the borers were tested individually and as hosts with the larvae of either of the Diatraea species alone or the larvae of both species. In the first experiment, the females were released for 10 min within the experimental arena using only olfactory cues. In the second experiment, C. flavipes females were individually released for 30 min. within the arena, allowing direct contact with its host, either D. saccharalis or D. flavipennella, or both host species at the same time. The wasps showed no preference for either one of the hosts, thus being able to locate borers in general. Palavras-chave: parasitismo, comportamento, broca da cana-de-açúcar.

Organic plant extracts and emulsified oil of Azadirachta indica A. Juss (Meliaceae) (neem) were studied to evaluate its effects in control of engorged females of Rhipicephalus (Boophilus) microplus (Canestrini, 1887) in the laboratory. Hexane and alcoholic organic extracts, 2% (weight/volume) were used in tests of immersion for 5 minutes, prepared with seeds, solubilized in dimethylsulfoxide (DMSO) to 1%. The experiment was entirely randomized, consisting of 6 treatments and 5 replicates, each represented by 5 ticks. Control groups consisted of untreated females. Based on the results of this work, we can indicate that the seed extract (hexanic fraction) and óleo emulsionável I¹ concentration to 2% have significant adjuvant potential to control the cattle tick, because, cause the mortality in the first days after the treatment and interfere in the reproduction, showing to be an alternative to acaricides normally used.

<p>O pulgão preto, <em>Aphis craccivora </em>Koch (Hemiptera: Aphididae), é considerado uma importante praga do feijão-caupi, <em>Vigna unguiculata</em> (L.) Walp (Fabaceae), pois se alimenta da seiva e transmite viroses. Com o surgimento de novas cultivares do feijão-caupi torna-se necessário o estudo da resistência dessas plantas frente ao ataque das pragas. O trabalho objetivou avaliar os aspectos biológicos de <em>A. craccivora </em>sobre três cultivares do feijão-caupi (Gurguéia, Vita 7 e TVu 408). Os insetos foram mantidos em discos foliares das respectivas cultivares e acondicionados em placas de Petri sobre solução de ágar-água a 1%. A cultivar TVu 408 influenciou de maneira negativa na duração do período reprodutivo bem como na sobrevivência e fecundidade média das fêmeas. As cultivares Gurguéia e Vita 7 mostraram-se suscetíveis ao desenvolvimento da praga.</p><p> </p>

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