Toxicity Aqueous Extract of Castor Bean (Ricinus communis) to Maconellicoccus hirsutus (Green) (Hemiptera: Pseudococcidae)
Anderson Mathias Holtz
Instituto Federal do Espírito Santo – Campus Itapina, BR 259, Km 70, Caixa Postal 256, CEP. 29717-000, Colatina, ES, Brazil.
José Romário de Carvalho *
Universidade Federal de Viçosa, Avenida P. H. Rolfs, s/no, Campus Universitário, CEP 36570-900, Viçosa, MG, Brazil.
Mylena da Silva Gomes
Instituto Federal do Espírito Santo – Campus Itapina, BR 259, Km 70, Caixa Postal 256, CEP. 29717-000, Colatina, ES, Brazil.
Vergilio Borghi Neto
Instituto Federal do Espírito Santo – Campus Itapina, BR 259, Km 70, Caixa Postal 256, CEP. 29717-000, Colatina, ES, Brazil.
Ana Beatriz Mamedes Piffer
Instituto Federal do Espírito Santo – Campus Itapina, BR 259, Km 70, Caixa Postal 256, CEP. 29717-000, Colatina, ES, Brazil.
Ronilda Lana Aguiar
Instituto Federal do Espírito Santo – Campus Itapina, BR 259, Km 70, Caixa Postal 256, CEP. 29717-000, Colatina, ES, Brazil.
*Author to whom correspondence should be addressed.
Abstract
The objective of this study was to evaluate the insecticidal effect of aqueous extract of castor bean (Ricinus communis) cake for the control of Maconellicoccus hirsutus. The toxicity tests were performed in the laboratory. Subsequently lethal concentrations 50 and 90% (LC50and LC90, respectively) were estimated. Tween80® + distilled water was used as surfactants and solvent respectively. The assay was performed in petri dishes containing a Coffea canephora leaf disc. The spraying was carried out in Torre de Potter spray tower. The extract was toxic to mealybug and the mortality data was adapted to the probit model. Estimates of LC50 and LC90 were 5.32% and 29.30%, respectively. It was concluded that the aqueous extract of R. communis cake is promising for the management of M. hirsutus.
Keywords: Insect pests, pink mealybug, Ricinus communis.