Efeito da lavagem artificial na eficiência de acaricidas-ovicidas no controle de Brevipalpus phoenicis (Geijskes, 1939) (Acari: Tenuipalpidae) em citros

Abstract

The objective of this research was to test the control of Brevipalpus phoenicis (Geijskes, 1939) by the hexythiazox and quinometionato products in citrus crop with and without adhesive spread and when submitted to artificial rain. The plants were sprayed at 2, 4, 8, 24 and 48 hours. When dried, the fruits were collected (eight/plants) and half of them were washed in laboratory with artificial rainfall on the basis of 30 mm/h during 15 minutes establishing the following treatments: T1 - hexythiazox + washing; T2 - hexythiazox + agral + washing; T3 - quinometionato + washing; T4 - quinometionato + agral + washing; T5 - control + agral + washing; T6 - hexythiazox; T7 - hexythiazox + agral; T8 - quinometionato; T9 - quinometionato + agral; T10 - control + agral. Thus, all the fruits were inoculated with ten females of B. phoenicis and five days later the mites alive were counted and eliminated. Approximately 15 days later the number of larvae alive were also counted. The results obtained allowed the following conclusions: a) the acaricides were efficient to control B. phoenicis; b) the rainfall (washing) did not alter the efficiency; c) the agral did not change the results.Estudou-se a eficiência dos acaricidas-ovicidas hexythiazox e quinometionato em frutos cítricos, com e sem espalhante adesivo e submetidos à chuva artificial. No campo, 2, 4, 8, 24 e 48 horas após pulverização foram coletados 8 frutos/planta. No laboratório, 4 desses frutos foram submetidos a chuva artificial de 30 mm/hora, durante 15 minutos, e 4 não sofreram lavagem. Em seguida, os frutos foram parcialmente impermeabilizados e 10 fêmeas de B. phoenicis foram colocadas por 5 dias nesses frutos. Estabeleceram-se os seguintes tratamentos: T1 - quinometionato + chuva; T2 -hexythiazox + agral + chuva; T3 - quinometionato + chuva; T4 - quinometionato + agral + chuva; T5 + testemunha + agral + chuva; T6 - hexythiazox; T7 - hexythiazox + agral; T8 - quinometionato; T9 - quinometionato + agral; T10 - testemunha + agral. Os resultados demonstraram a eficiência dos produtos e não registraram efeitos desfavoráveis da chuva artificial e nem favoráveis do espalhante adesivo