Navegando por Autor "Zanúncio, José Cola"
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Item Efeito do Silício em aspectos comportamentais e na história de vida de Tuta Absoluta (Meyryck) (Lepidoptera: Gelechiidae)(Revista Brasileira de Agropecuária Sustentável (RBAS), 2012-07) Santos, Marília Cristina dos; Junqueira, Ana Maria Resende; Sá, Veríssimo Gibran Mendes de; Zanúncio, José Cola; Bauch, Marcos Alexandre; Serrão, José EduardoA tecnologia baseada no uso do silício diminui o uso de agrotóxicos, mantendo a qualidade de frutos e protegendo o ambiente. Este trabalho teve como objetivo avaliar a utilização de diferentes fontes e doses de silício em plantas de tomate sobre aspectos biológicos e preferência de oviposição da traça-dotomateiro (Tuta absoluta). O delineamento experimental foi em blocos casualisados contendo vinte e um tratamentos incluindo a testemunha, em cinco repetições [(Agrosilício® solo (t ha-1 de SiO2) - 0,45; 0,90; 1,35 e 1,80); (Agrosilício® foliar (t ha-1 de SiO2) - 2,0; 4,0; 6,0 e 8,0); (Sili-K® (l ha-1 de SiO2) - 0,5; 1,0; 2,0 e 3,0); (Ácido silícico foliar (% de SiO2) - 0,25; 0,50; 0,75 e 1,00); (Ácido silícico solo (% de SiO2) - 0,25; 0,50; 0,75 e 1,00) e controle]. Os parâmetros biológicos avaliados foram: duração das fases larval e pupal, sobrevivência de larvas e pupas e peso de pupas machos e fêmeas. A não preferência para oviposição de T. absoluta em plantas de tomateiro tratadas com silício foi avaliada através de testes com e sem chance de escolha. Não foram observadas diferenças na duração das fases larval e pupal, sobrevivência de lagartas e pupas, peso de pupas machos e fêmeas de T. absoluta e preferência de oviposição em indivíduos provenientes dos tratamentos com silício aplicado no solo e daquelas do grupo controle. Insetos obtidos dos tratamentos à base de silício aplicado via foliar apresentaram aumento na duração das fases larval e pupal, diminuição na sobrevivência de lagartas e pupas, diminuição do peso de pupas machos e fêmeas e diminuição na preferência de oviposição.Item Leaf consumption and duration of instars of the cassava defoliator Erinnyis ello (L., 1758) (Lepidoptera, Sphingidae)(Revista Brasileira de Entomologia, 2002) Pratissoli, Dirceu; Zanúncio, José Cola; Barros, Reginaldo; Oliveira, Harley Nonato deThe objectives of this research were to evaluate leaf consumption and the developmental time of the larvae of Erynnyis ello (L., 1758) (Lepidoptera, Sphingidae) reared on cassava, in order to obtain information for the integrated management of this pest. The larvae were reared on excised cassava leaves in Petri dishes and later in gerbox, and kept in chambers at 24 ± 2 ºC and 75 ± 10% RH. The total leaf area consumed by the larva to complete its development was 589.67 cm2; each of the five instars consumed, respectively: 1.89 cm2; 5.74 cm2; 17.48 cm2; 76.66 cm2; and 487.90 cm2. The consumption by the first three instars was insignificant, and did not reach 5% altogether; the 4th represented 13%; the 5th presented a consumption significantly higher, about 82.7%. The total time for the larval development was 22.61 days, and the duration for each of the five larval instar was, respectively: 4.35; 3.19; 3.32; 4.52; and 4.94 days. The pre-pupal period lasted 2.29 days. Since the highest consumption is by the 5th instar larva, the control should be applied before this age to avoid heavier damages to the cassava crop.Item Relationship between chemical properties of the soil and the occurrence of Bacillus thuringiensis(Ciência Rural, 2009-01) Polanczyk, Ricardo Antonio; Zanúncio, José Cola; Alves, Sérgio BatistaThe soil and other substrates such as mushroom compounds are the main sources of new Bacillus thuringiensis (Bt) isolates for Integrated Pest Management programs. This study describes the relationship between chemical properties of the soil (pH, OM, P 3+ , K 1+ , Ca 2+ , Mg 2+ , H 1+ +Al 3+ , B 3+ , Cu 2+ , Fe 2+ , Mn 2+ and Zn 2+ ) and the occurrence of Bt in Brazil. A total of 1,197 bacterial colonies were obtained, being 512 of them identified as Bt. The Bt index (iBt), which is the relation between Bt colonies and bacterial counts ranged from 0.18 to 0.86. The iBt may be expressed with the formula: iBt= -0.4 + 0.6Ca 2+ + 0.07Cu 2+ + 0.009Fe 2+ – 0.53Mg 2+ -0.12Mn 2+ + 1.26Zn 2+ . A cluster of samples with fewer colonies and a high negative correlation (antagonism) between Mn 2+ and Ca 2+ ; Mg 2+ and Ca 2+ ; Mg 2+ and Zn 2+ ; Mn 2+ and Zn 2+ and a high positive correlation (synergism) between Mn 2+ and Mg 2+ ; Zn 2+ and Ca 2+ was observed. The relationship between these elements and their effect on the Bt presence are discussed.Item Trichogramma acacioi (Hymenoptera, Trichogrammatidae) parasitism capacity at different temperatures and factitious hosts(Revista Brasileira de Entomologia, 2009-03) Pratissoli, Dirceu; Bueno, Adeney de Freitas; Bueno, Regiane Cristina Oliveira de Freitas; Zanúncio, José Cola; Polanczyk, Ricardo AntonioIt was studied the parasitism capacity of Trichogramma acacioi on Anagasta kuehniella and Sitotroga cerealella eggs at different temperatures (15, 20, 25, 30 and 35 ± 1°C). The parasitism of T. acacioi varied with temperature and host. The highest parasitism (³80%) were observed during the first days after emergence in both hosts, at all tested temperatures. The accumulated parasitism varied with both host and temperature, being higher on A. kuehniella at 20°C, what shows good parasitoid species adaptation to this temperature. Thus, we conclude that the best host and best temperature to be used at mass-rearing of T. acacioi is A. kuehniella and 20ºC, respectively. Moreover, this Trichogramma species has great potential to be used in field releases at regions where average temperature is around 20ºC.