Bacharelado em Ciências Biológicas (UAST)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2931
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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2 resultados
Resultados da Pesquisa
Item Avaliação de extratos secos vegetais para o manejo de Callosobruchus maculatus fabr. (1775) (Coleoptera: Chrysomelidae) em feijão-caupi armazenado(2023-05-02) Santos, Priscila Araujo dos; Oliveira, Carlos Romero Ferreira de; http://lattes.cnpq.br/2515051171734004; http://lattes.cnpq.br/1451445237327488The beetle Callosobruchus maculatus (Fabr., 1775) (Coleoptera: Chrysomelidae) is considered the main pest of Vigna unguiculata (L.) Walp - Leguminosae (Cowpea) under storage conditions. The use of products of a plant nature, such as powders, aqueous extracts, and oils for the control of agricultural pests have been studied as an alternative for a more sustainable management. Research using vegetable powders is less frequent but of great importance for the small producer, because it has a low cost of preparation, are easy to obtain and use, and do not require skilled labor. The objective of this work was to evaluate the effect of dry plant extract from the leaves of Croton pulegiodorus Baill. – Euphorbiaceae (Velaminho), Momordica charantia L. – Cucurbitaceae (Melon-de-são-caetano) and Sarcomphalus joazeiro (Mart.) Hauenshild – Rhamnaceae (Juazeiro), on mortality, repellency, oviposition and emergence of C. maculatus in stored cowpea. Arenas consisting of plastic pots (140ml), containing 20g of cowpeas, were used, in which the dry extract of each plant was added separately according to the treatments (0g, 1g; 1.5g; 2g; 2.5g and 3g). After assembling the arenas, 10 non-sexed adult insects were inserted, which were confined for 48 hours in B.O.D (28±2°C, 70±5UR and 24h scotophase). For the mortality test, the live and dead insects were counted, then they were discarded and the data obtained were submitted to ANOVA, and the means were compared by Tukey's test (P < 0.05). For the repellency, arenas composed of two plastic containers, symmetrically interconnected by two plastic tubes, to a central container were used. In the two side pots, 20g of cowpea were deposited, adding in one of them the established amount of dry vegetable extract (treatment) and the other, corresponded to the control. In the central box, 10 adult insects of C. maculatus were released in 10 replications. The insects attracted to each treatment were counted, and the Repellency Index (RI) was determined. The beetles were removed and the number of eggs in all grains was counted, which were transferred to small plastic pots (140ml) and taken back to B.O.D. After 30 days of storage, the number of adult insects emerged was counted. The experiments were carried out in a completely randomized design with 10 replications. The results of RI, oviposition and emergence were submitted to Student's t test to determine their statistical significance. The dry plant extract Croton pulegiodorus was the one that showed the best results among all the plants used, it was the only species that caused mortality of the insects with percentages ranging from 58% to 96%. The RI demonstrated that the treatments containing the dry extract of C. pulegiodorus and S. joazeiro were the only ones that presented repellent effect, which significantly interfered in the oviposition and emergence of insects. It was demonstrated that the extracts of the leaves of C. pulegiodorus and S. joazeiro are promising for the management of C. maculatus. On the other hand, M. charantia did not affect the behavior of the pest in any of the experiments performed, being considered neutral.Item Atividade insetistática de pós de origem vegetal sobre Sitophilus zeamais Motschulsky (1855) em milho armazenado(2020) Magalhães, Aline Pereira de; Oliveira, Carlos Romero Ferreira de; http://lattes.cnpq.br/2515051171734004; http://lattes.cnpq.br/7331352853811552Corn is one of the main agricultural crops in Brazil, as it is used to several by-products, fact that contributes to its comercial value and the economic movement in the country. It is an energetic aliment which has high nutricional value and is easy accessible, been part of human and animal diet. However, there are considerable damages due the attack of pest insects, mainly caused by Sitophilus zeamais Motschulsky, 1855 (Coleoptera: Curculionidae), which has great agricultural importance, for attacking in the field and in the warehouses, in addition to destroying the healthy grain, taking the chance to ovoposit, being considered, therefore, internal primary pest. This pest control is carried out with synthetic insecticides, however, its use is harmful to the environment, besides human and animal heath. The use of vegetable origin powders has been shown to be effective against stored grain pests, moreover, it is easy to obtain and use, also being within the range of the small farmer. The aim of this paper was to evaluate the toxicity and repellency of five powders of vegetable species on S. zeamais. Leaves of Croton pulegiodorus (Velaminho), Momordica charantia (Melão-de-São-Caetano), Azadirachta indica (Nim), Prosopis juliflora (Algaroba) e Ziziphus joazeiro (Juazeiro) were dried and ground, separately, to obtain a refined powder, subsequently applied to samples of corn kernels, in different powder amounts (0g, 1g, 2g, 3g, 4g, 5g), contained in Petri dishes (mortality assessment) and in interconnected flasks (repellency assessment). Each treatment was infested with 10 non-sexed adult insects, using six replications in a completely randomized design, at room temperature. All experiments were evaluated after a period of 72 hours. Only C. pulegiodorus caused high insect mortality (76.67% to 100%), being extremely low when in contact with other plants (0% in Z. joazeiro to 26.67% in A. indica). In addition, the mortality caused by A. indica was higher than that of the control only in the 3g amount of powder, while the other species (P. juliflora, Z. joazeiro and M. charantia) did not differ from the control and neither among themselves. It was observed that only C. pulegiodorus had a repellent action, as the other plants were considered neutral. These results demonstrate that the dry extract (powder) of velaminho (C. pulegiodorus) is a promising alternative for the management of S. zeamais in stored corn as it has biological activity on this coleopteran.