Fatores de mortalidade natural da cochonilha-farinhenta Planococcus citri no cafeeiro / Natural mortality factors of mealy-mealybug Planococcus citri in coffee
AUTOR(ES)
Nilson Rodrigues da Silva
FONTE
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
26/07/2011
RESUMO
Understanding the factors that regulate populations of insect pests is of fundamental importance in the development of programs for integrated pest management. Scale insects, especially Pseudococcidae family, have reached the "status" in many pests in crops such as coffee plant. In one group of pests is the most important species Planococcus citri (Risso) (Hemiptera: Pseudococcidae). However, there are few studies on the mechanisms that regulate their populations. Thus, this study aimed to determine the factors that regulate P. citri populations in coffee using ecological life tables. For this purpose, were made during 50 generations ecological life tables for P. citri. The population of P. citri was kept in balance mainly due to predators. The predators of eggs and nymphs of 1st and 2nd instars were: Neuroptera: Chrysopidae, Diptera: Syrphidae and Diptera: Dolichopodidae and adults and larvae of Coleoptera: Coccinelidae. Predators of 3rd instar nymphs and adults were: Harmonia axyridis (Pallas), Chrysoperla Steinmann (Steinmann) and Chrysoperla externa (Hagen). The critical stage of mortality of P. citri was the third instar nymphs and the key factors of mortality were the predators H. axyridis, C. Steinmann and C. externa. Therefore, the population of P. citri in coffee plant was regulated by predation on third instar nymphs by these natural enemies.
ASSUNTO(S)
café fator-chave fase-crítica fitotecnia coffee key-factor phase-critical
Documentos Relacionados
- Parasitismo da cochonilha-farinhenta Planococcus citri (Hemiptera: Pseudococcidae) por Coccidoxenoides perminutus (Hymenoptera: Encyrtidae) 1
- Factors of natural mortality of Coccus viridis in coffee
- Inverse Meiosis in Triploid Females of the Mealy Bug, Planococcus Citri
- Sobre o condicionamento alimentar na cochonilha-branca, Planococcus citri (Risso) (Hemiptera: pseudococcidae)
- The Effects of Radiation Damaged Heterochromatic Chromosomes on Male Fertility in the Mealy Bug, Planococcus Citri (Risso)