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Rio Largo, Brazil

Broglio S.M.F.,Federal University of Alagoas | Dias-Pini N.S.,Embrapa Agroindustria Tropical | Micheletti L.B.,CECA | Gomez-Torres M.L.,University of Sao Paulo
Revista Colombiana de Entomologia | Year: 2014

Coccidophilus citricola is an important predator of Diaspis echinocacti, a scale insect that is the main pest of the forage cactus Opuntia ficus-indica cultivated in northeastern Brazil. The efficiency of a management program involving the natural enemy of an agricultural pest can be increased by adopting conservation techniques. The aim of the present study was to evaluate the selectivity of querobão, mineral oil, NatuneemTM, aqueous extract of neem leaves, and conidia of Beauveria bassiana and Metarhizium anisopliae towards the predator. Aliquots of phytosanitary products were sprayed on sections (5 x 5 cm) of cactus rackets infested with D. echinocacti obtained from forage cactus grown under greenhouse conditions. Sections were dried and offered to second-generation C. citricola adults that had been reared under laboratory conditions. Predator mortalities were assessed at 24, 48 and 72 h after application of the products or water control. Querobão and NatuneemTM were most toxic to the predator, with high levels of mortality recorded at 24 and 48 h. Conidia of B. bassiana and M. anisopliae (1 x 108 conidia mL-1) were less toxic and slower acting, with highest mortalities occurring between 48 and 72 h. The toxicities of mineral oil, neem leaf extract and M. anisopliae (1 x 107 conidia mL-1) towards C. citricola were not significantly different from the control. It is concluded that these agents may be selective to the natural enemy of D. echinocacti and could be used in combination with the predator to control this pest in forage cactus cultures. © 2014 Sociedad Colombiana de Entomologia. All rights reserved. Source


Broglio-Micheletti S.M.F.,Federal University of Alagoas | de Souza L.A.,CECA | Valente E.C.N.,University of Pernambuco | de Araujo M.J.C.,University of Pernambuco | And 2 more authors.
Idesia | Year: 2012

The aim of this study was to evaluate in the laboratory different isolates and concentrations of conidia of Metarhizium anisopliae (Metschnikoff, 1879) Sorokin, 1883 and Beauveria bassiana (Balsamo) Vuillemim, 1912 for control of the cattle tick. The conidial suspensions were prepared from fungi grown in rice medium in polypropylene bags. The tests were performed by immersion of engorged females collected from animals not treated with acaricides. The experimental design was completely randomized with 20 treatments and 5 repetitions, each consisting of 5 females. The mortality rate caused by the fungus M. anisopliae ranged from 92 to 100%, while for B. bassiana it was 44 to 100%; mortality was greater at concentrations of 10 8 and 10 9 conidia mL -1 suspension. The isolates B. bassiana Fitossan 1 and M. anisopliae PL 43 (both at 10 9 conidia mL -1) and Fitossan 4 (10 8 conidia mL -1) within 14 days of treatment killed 100%, 92% and 88% of the engorged females, respectively. In general there was no difference in the weight of eggs from females treated with the same isolate at concentrations of 10 7, 10 8 and 10 9 conidia mL -1, although isolates of M. anisopliae had lower weight. The efficiency of control ranged from 0% (control with water) to 31.30% (M. anisopliae Fitossan 4, 10 8 conidia mL -1). Source


Reis L.S.,CECA | de Azevedo C.A.V.,Bairro Universitario | Albuquerque A.W.,CECA | Junior J.F.S.,Sao Paulo State University
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2013

The tomato cultivation in the greenhouse has been expanded in the last years, mainly, in the South and Southeast regions of Brazil, whose purpose is to improve the productivity and the quality of the agricultural products, offering regularity in the production. The present study aimed to determine, along the crop cycle, the relationship between the leaf area index and the productivity, and at the end of the cycle, the components of production of the tomato in the greenhouse. The models were generated through polynomial equations of 1st and 2nd order, having as independent variable the number of days after the transplanting. It was verified that it is possible to determine, in the greenhouse, through mathematical models, the leaf area index of the tomato crop considering the days after the transplanting. Basing on values of leaf area index, the productivity of the crop and the period of the maximum productivity can be determined, aiding the farmers to determine the best sowing and transplanting time of the tomato crop. Source


Filho J.T.A.,CECA | Costa R.G.,Federal University of Paraiba | Fraga A.B.,CECA | de Sousa W.H.,Paraiba | And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2010

This study was performed with the objective of assessing the effects of feed and genotype on the quantitative characteristics of carcasses of lambs finished in a feedlot and estimate gross margins. Eighteen lambs of each genotype were used: Morada Nova, Santa Inês and cross-breed Dorper × Santa Inês. Feeds with low and high energetic levels consisted of 2.5 Mcal ME/kg DM and 2.94 Mcal ME/kg DM, respectively. A randomized complete design was used, with a 3 × 2 factorial scheme. The diets influenced daily weight gain, empty body weight, body score, feed efficiency and feedlot days, whilst the genotype promoted differences in all the variables studied. The caloric density of the diets influenced the biological hot and cold carcass yields, and the latter two were influenced by genotype. The more energetic diet (2.94 Mcal EM/kgDM) resulted in higher absolute weights of neck, shoulder, rib, loin and leg, but, in relative values, lambs fed with different energetic levels did not differ for these characteristics, regardless of the energetic level of the diet. The percentage yield of the cuts was influenced by the genotypes, except for the neck. The weights of all the cuts were influenced by genotypes. The treatment with the highest energy level resulted in the largest gross margin. © 2010 Sociedade Brasileira de Zootecnia. Source


de Farias A.P.,Instituto Federal Of Alagoas | de Albuquerque A.W.,CECA | Filho G.M.,CECA | Reis L.S.,CECA
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2013

The present study was aimed to evaluate the productivity of Heliconia psittacorum x Heliconia pathocircinada, cv. Golden Torch, when submitted to different sources of organic manure. The experiment was conducted at Escola Agrotécnica Federal, in Satuba, Alagoas State (Brazil). The experimental design was randomized blocks with 5 replications and 10 treatments: T1(control, without fertilization; T2) mineral fertilizer; T3) farm yard manure; T4) chicken bedding; T5) filter cake; T6) urban garbage compound; T7) farm yard manure + mineral fertilizer; T8) chicken bedding + mineral fertilizer; T9) filter cake + mineral fertilizer; T10) urban garbage compound + mineral fertilizer. The following variables were evaluated: number of the tillers per clump, the beginning of the flowering, number of the flower stem per clump, length of flower stem, diameter of flower stem, length of bract, interval of the flowering, number of leaves per flower stem and leaf area of flower stem. The fertilization organomineral provided a significant increase in the variables: number of tillers per clump, length of flower stem, number of flower stem per clump, length of bract, floral stem, diameter of flower stem and leaf area, contributing also to the precocity harvest and smaller flowering interval, when compared with organic fertilizers and control. Source

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