The soursop (Annona muricata L.) in Trinidad: its importance, pests and problems associated with pest control.
Studies on the control of pests of soursop (Annona muricata) in Trinidad and Tobago using insecticides and a bagging method are described. Dimethoate (Rogor 40), carbaryl (Sevin), fenthion (Lebaycid) and permethrin (Ambush) at 0.02% a.i. were tested for the control of the xyloryctid Cerconota anonella and the eurytomid Bephroides macullicolis. Both fenthion and permethrin gave complete control of C. anonella. Of the harvested fruit, 79 and 75% of those treated with fenthion and permethrin, respectively, were infested by B. macullicolis. Permethrin, dimethoate and carbaryl were phytotoxic to A. muricata. Fenthion caused slight burning of young fruit, but did not affect fruit development. It is recommended that fenthion should be applied at 7-day intervals for the control of C. anonella. The use of fibre-glass mesh and plastic bags successfully protected fruit from attack by both pest species. It is recommended that unblemished fruits should be bagged before they are 6 cm long. The pseudococcid Planococcus citri attacked fruit in both types of bag and insecticide treatment was necessary for its control.