No presente trabalho, avaliaram-se as atividades translaminar, sistêmica e de contato do extrato aquoso de sementes de
Azadirachta indica A. Juss. (nim) sobre a traça-do-tomateiro Tuta absoluta (Meyrick). Foram realizados três experimentos envolvendo
extratos aquosos de sementes de nim em concentrações de 0,5; 1,0; 5,0 e 10,0 g por 100 mL de água. Esses extratos foram aplicados
no solo, na superfÃcie adaxial de folÃolos de tomateiro e diretamente sobre as lagartas. Quando os extratos foram aplicados no solo, em
vasos contendo plantas de tomate, houve mortalidade de 48,3 a 100,0% das lagartas, indicando que foram absorvidos e translocados
na planta. Também ocorreu mortalidade larval de 57,0 a 100,0% quando os extratos foram aplicados na superfÃcie adaxial do folÃolo,
evidenciando o efeito translaminar. Quando foi aplicado diretamente sobre lagartas com seis dias de idade, observou-se mortalidade de
52,4 a 95,4%, demonstrando a ação de contato do composto e seu potencial para controle da traça-do-tomateiro.
This work, aimed to study the translaminar, systemic and contact action of aqueous neem seeds extracts on the tomato
leafminer Tuta absoluta (Meyrick). Three experiments with aqueous neem seeds extracts at concentrations of 0.5; 1.0; 5.0 and 10.0g/
100 mL of water were conducted. These extracts were applied in the soil, in adaxial surface of the tomato plant foliole and directly
over the insect. When the extracts were applied in the soil of pots containing tomato plants, the larval mortality rate was 48.3% to
100.0%, indicating that the extracts were absorbed and transferred inside the plant. There was also a larval mortality of 57.0% to
100.0% when the extracts were applied over the foliole adaxial surface, which shows the translaminar action. When the extracts were
applied directly over larvae six days old, the larval mortality rate was 52.4% to 95.4%, which shows the action of contact of the
extracts and its potential to control the tomato leafminer.
