MELO, B. A.; http://lattes.cnpq.br/8696429164703232; MELO, Bruno Adelino de.
Résumé:
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.