Potencial inseticida de espécies vegetais da caatinga sobre Callosobruchus maculatus (FABR., 1775)(Coleoptera: bruchidae).

Abstract

The Ca//osoóruchus maca/aras (Fabr., 1775), commonly known as cowpea weevil is considered a major cowpea pesos in the Northeast region, which is an important crop in this region. In this study aimed to evaluate the e#ect of mne species Caatinga plants of on repeHency, mortality and nproduetion of C. maca/alas. The species were cumuru (Amóurana ceanns/s), marmeleiro (C/otan sonderlanus), mussambê (C/eome q)/Rosa). jurema (Mimosa tenuiflora), angico (Anadêrlanff7era mac/ocarpa), pereiro ( 4spidosl)empa pynb//um) mangirioba (Senda occidenfa#s), alfazema-brava (}lfypfis suaveo/ens) and juazeiro (.Zfziphus .©azefío)- For each plant species was prepared from a gire powder leaves and branches. Three bioassays were performed, and they are repellency, mortality and reproduction. The repellency bioassay was conducted in an arena closed about 35 an diameter, with six containers (50 ml) distributed equidistant from one another. In these container were placed, altemately, 1.5 g deaned and processed powders grains powder of each plant species in the study and after 24hs release of thirty C. maca/aftas females were recorded insects number of that were in every container. Mortality and reproduction were evaluated using a pair of cowpea-weevil conüned in containers (100 ml) contalning cowpea grains treated with powdered plant species above related. Mortality was monitored daily recording of females and males number on tive and dead each treatment. In the reproduction test were determined eggs raid number, emergency percentage and sex ratio. The female preference C. macuJafes on clean grains ranged between was 77 and 94%, by the way when used powders and leaves 73 to 93o% when used for post branches, indicating a strong repellent for grain treated with post these species. The powders studied did not cause mortality on females, but reduced mate longevity. The was no significative difference in the total eggs number of cowpea-weevil placed on treated grain with studied plants (F = 0.002, gl = 1 , 76, P 2 5%). There was reduction in adult emergente, which was observed in grains treated with powdered leaves and powders mussambê, pereiro and juazeiro. There was also effect post on the beetles sex ratio, reducing female number emerged when comparing the type of powder within species, highlighting the mussambê (powder leaves), the jurema (powder branches), the angico {powder branches) and pereiro (aushed twigs), which were in about 40% of females less. According to results we can conclude that the use of Caatinga planta powders are promising way infestations management cowpeaweevVil.