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Alternative treatments diminish oviposition and viability of Leucoptera coffeella (Lepidoptera: Lyonetiidae) eggs and larvae on coffee plants
(Editora UFLA, 2021) Androcioli, Humberto Godoy; Hoshino, Adriano Thibes; Meneghin, Ana Maria; Ventura, Mauricio Ursi; Guide, Bruna Aparecida; Hata, Fernando Teruhiko; Menezes Junior, Ayres de Oliveira
The effects of alternative treatments on the oviposition and viability of Leucoptera coffeella eggs and larvae were evaluated. Under controlled conditions, coffee sprouts cv. IAPAR-59, eight months old, were sprayed with brown propolis extract (1%), pyroligneous extract with pepper and garlic (PEPG) (2%), silicate clay (2%), kaolin (5%), lime sulfur (2%), neem oil (1%) and kaolin + neem oil (5% + 1%), distilled water and no treatment. In a first no-choice bioassay, coffee sprouts were sprayed before oviposition and kept in cages, where adult insects within three days after emergence were released. Adults remained in the cages for 24 hours. Eggs were then counted. 10 eggs per sprout were preserved to verify larval mortality. The number of eggs when treated with propolis extract, neem oil, kaolin + neem oil and PEPG decreased in the evaluations. Treatments with neem oil caused greater larval hindrance. Eggs laid on leaves were also sprayed with the treatments. Egg viability was reduced by treatments containing neem oil and lime sulfur. Neem oil treatments resulted in slim adult emergence; intermediate viability with lime sulfur and slight hindrance with silicate clay. Finally, treatments were also sprayed on leaves, hosting first or third instar larvae. Neem treatment caused high mortality for 1st and 3rd instar larvae, however, this effect was reduced when mixed with kaolin. Nonetheless, these negative effects disappeared when considering the adult survival ratio. Results indicated that propolis extract, PEPG and neem oil treatments are suitable for reducing egg deposition, neem oil considerably diminished larvae survival and adult emergence.
Comunidades de parasitóides de Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) (Lepidoptera: Lyonetiidae) em cafeeiros nas regiões Oeste e Sudoeste da Bahia
(Editora UFLA, 2007-07) Melo, Thiago Lima; Castellani, Maria Aparecida; Nascimento, Maria de Lordes do; Menezes Junior, Ayres de Oliveira; Ferreira, Gabriel Fernandes Pinto; Lemos, Odair Lacerda
Objetivou-se conhecer a diversidade e a estrutura das comunidades de parasitóides de Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) nas regiões Oeste, município de Luiz Eduardo Magalhães, e, Sudoeste, município de Vitória da Conquista, do Estado da Bahia. Os estudos foram desenvolvidos nos anos de 2002 e 2003, por meio de coletas mensais de folhas do quarto par, de ramos nos três estratos da planta e caídas no solo, totalizando 1600 folhas por região e período de coleta, coletando-se minas contendo pupas de parasitóides e crisálidas. O material foi mantido no Laboratório de Entomologia da Universidade Estadual do Sudoeste da Bahia, em temperatura ambiente, visando à emergência de adultos. A estrutura das comunidades foi avaliada por meio dos índices faunísticos freqüência, constância, dominância e diversidade. Foram identificadas seis espécies de parasitóides pertencentes à Braconidade e Eulophidae, registrando-se os parasitóides Cirrospilus neotropicus (Diez & Fidalgo, 2003); Closteroscerus coffeellae (Ihering, 1914); Horismenus aeneicollis (Ashmead, 1904); Neochrysocharis coffeae (Ihering, 1914); Stiropius sp.1 e Stiropius sp.2, associados ao bicho-mineiro do cafeeiro. Há diferenças na estrutura das comunidades de parasitóides em função das regiões estudadas, sendo que na Região Oeste a espécie predominante foi N. coffeae, enquanto que na região Sudoeste, H. aeneicollis e Stiropius sp.1 foram as predominantes.