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Ciência Rural

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VOLPE, Haroldo Xavier Linhares et al. Volumetric distribution of spray containing Metarhizium anisopliae. Cienc. Rural [online]. 2012, vol.42, n.11, pp.1909-1915.  Epub Sep 04, 2012. ISSN 0103-8478.

The microbial control of Mahanarva fimbriolata is very important to management of this pest in sugarcane crops, however lacks improvement in spraying technology. The work aimed to evaluate a nozzle model adequate to control M. fimbriolata, based on pattern of spray distribution and the space between nozzles. TF4, TTI and AIUB11004VS nozzles containing the fungus Metarhizium anisopliae without adjuvant, with Agral 2% and 4% were used in the assay. We evaluated spacing between nozzles by constructing deposition curves considering maximum CV of 10%, spray angle and nozzle flow for different sprays. The larger nozzle spacings were 85cm for spray with 2% of adjuvant and TF4 nozzle, 70cm for AIUB11004VS without adjuvant addition and 55cm TTI nozzle, independent of spray used. Despite the spray angle, we observed difference between the nozzles to the same spray. The flow was larger for spray with adjuvant at 4%, to TF4 and TTI, while AIUB11004VS showed minor flows when compared to the others nozzles using 2% and 4% of adjuvant. By presenting good results of distance between nozzles and minor spray consumption, AIUB11004VS is a good tool for control of M. fimbriolata.

Keywords : application technology; spacing between nozzles; biological control; microbial control; root froghopper; Mahanarva fimbriolata; Metarhizium anisopliae.

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