Physiologic selectivity of insecticides used in coffee crop on the predators Chrysoperla externa (Hagen, 1861) (Neuroptera: Chrysopidae) and Cryptolaemus montrouzieri Mulsant, 1853 (Coleoptera: Coccinellidae) / SELETIVIDADE FISIOLÃGICA DE INSETICIDAS UTILIZADOS EM CAFEEIRO SOBRE OS PREDADORES Chrysoperla externa (HAGEN, 1861) (NEUROPTERA: CHRYSOPIDAE) E Cryptolaemus montrouzieri MULSANT, 1853 (COLEOPTERA: COCCINELLIDAE).

Luiz Carlos Dias Rocha

For the use of predators for pest control in the coffee crops in association with pesticides it is important that these compounds be selective to these natural enemies The physiologic selectivity of pesticides used in coffee crop on these predators Chrysoperla externa (Hagen 1861) (Neuroptera Chrysopidae) and Cryptolaemus montrouzieri Mulsant 1853 (Coleoptera Coccinellidae) was evaluated The bioassays were carried out at the Laboratory of Selectivity Studies of the Department of Entomology of the Universidade Federal de Lavras UFLA in Lavras MG under controlled conditions at 25Â2ÂC RH of 70Â10% with a 12h photophase The following pesticides and rates of application in g or mL a i L-1 were used thiamethoxam (0 5) imidacloprid (0 7) mineral oil (13 3) endosulfan (2 63) and dimethoate (0 48) Distilled water was used as control The sprayings of the pesticides were accomplished using a Potter s tower The following parameters were evaluated the specimens survival after the application of the compounds the length of the developmental phases the oviposition and the viability of the laid eggs from the treated insects The action of the compounds when applied on eggs was similar and all pesticides were classified in the class 2 according to the IOBC classification except the mineral oil which was selective The insecticides thiamethoxam imidacloprid endosulfan and dimethoate were harmful (class 4) to larvae of this green lacewing species However thiamethoxam and imidacloprid were harmful (class 4) to adults whereas the other compounds were slightly harmful (class 2) Mineral oil was selective to C externa and slightly harmful to pupae and adults Regarding C montrouzieri thiamethoxam and imidacloprid were harmful (class 4) followed by endosulfan when applied on both larvae and adults Mineral oil was slightly harmful (class 2) to first-instar larvae and selective (class 1) to the other stages of development of this predator The compounds classified as harmful (class 4) to C externa and C montrouzieri under laboratory conditions need to be evaluated under semifield and field conditions aiming to confirm their toxicity On the other hand mineral oil can be used together C externa and C montrouzieri in programs of pest management of the coffee crop due to its low toxicity

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