NEMATÓIDES ENTOMOPATOGÊNICOS COMO CONTROLADORES BIOLÓGICOS DE CIGARRINHAS DO GÊNERO Mahanarva (HEMIPTERA: CERCOPIDAE)
AUTOR(ES)
Elder Simões de Paula Batista
DATA DE PUBLICAÇÃO
2010
RESUMO
The spittlebugs belonging to the genus Mahanarva cause damage to the Poaceae family cultures, like signal grass, elephant grass and sugar cane, by the sap feeding on roots (immature phase) and leaves (adult phase). With the increase demand to reduce use of chemical insecticides for the insect pests control, comes the need to develop new control methods. In this scenario, the biological control gains highlight and in the spittlebugs case, the entomopathogenic nematodes (EPNs) are potential control agents, exploring the soil surface, the same pest environment while it feeds on roots. Thus, with the aim to know the EPNs action and to screening strains of these pathogens against the leaf spittlebug, Mahanarva spectabilis, and the root spittlebug, Mahanarva fimbriolata, experiments were conducted with various EPNs strains over different insect development phases. In two experiments M. spectabilis and M. fimbriolata nymphs were exposed to the pathogens, in laboratory and greenhouse conditions, and then were screened the more pathogenic strains to each pest species. Following, were evaluated the efficiency of four application methods of EPNs (pippeting, spray over nymphs with and without froth and infected host cadaver) over the leaf spittlebug, at greenhouse. At last, were evaluated the efficiency of an EPN species over eggs and adults of the leaf spittlebug. All tested strains are pathogenic to the spittlebugs nymphs causing 40-92% and 38-90% mortality at laboratory and 14-71% and 48-72% at greenhouse, to M. spectabilis and M. fimbriolata, respectively. The more efficient application methods were spray over nymphs with froth and infected host cadaver, with no difference because the concentrations and strains. Observations showed that dont occurs eggs infection by EPNs in leaf spittlebugs. The leaf spittlebug adults not were infected by the EPNs, and no egg reduction were observed. The most pathogenic EPNs strains were Steinernema riobravis, S.feltiae and Heterorhabditis amazonensis RSC1 to M. spectabilis and S. feltiae, S. riobravis, H. baujardi LPP7 and S. carpocapsae to M. fimbriolata. Thus I conclude that entomopathogenic nematodes can be utilized to control Mahanarva genus spittlebugs, and can be inserted in integrated pest management programs, should to be applied over nymphs exclusively, sprayed over the froth or through infected host cadevers
ASSUNTO(S)
heterorhabditis heterorhabditis pastagens cana-de-açúcar steinernema sugar cane comportamento animal biological control controle biológico pastures steinernema
ACESSO AO ARTIGO
http://www.bdtd.ufjf.br/tde_busca/arquivo.php?codArquivo=683Documentos Relacionados
- Virulência de nematoides entomopatogênicos (Rhabditida: Steinernematidae, Heterorhabditidae) para cigarrinha-das-pastagens Mahanarva spectabilis (Hemiptera: Cercopidae)
- Resistance of Gramineae to Mahanarva fimbriolata (Stål, 1854) (Hemiptera: Cercopidae)
- Avaliação de nematóides entomopatogênicos (Nemata: Rhabditida) eficiência de Heterorhabditis sp. contra a cigarrinha da raiz da cana-de-açúcar Mahanarva fimbriolata (Fabr.) (Hemiptera: Cercopidae)
- Impacto da fotofase na biologia de Mahanarva fimbriolata (Stal, 1854) (Hemiptera: Cercopidae)
- Técnicas de criação, em latoratório, de Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae)