Neotropical Entomology (2004) 33, 91-98

Leila L. Dinardo-Miranda, Álvaro L. Coelho and José M.G. Ferreira (2004)
Influência da Época de Aplicação de Inseticidas no Controle de Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae), na Qualidade e na Produtividade da Cana-de-açúcar
[Influence of time and rate of application of insecticides on Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) control and on quality and yield of sugarcane]
Neotropical Entomology 33 (1), 91-98
Abstract: The objective of this work was to study the effect of insecticides on sugarcane root froghopper mortality and on the technological quality and yield of sugarcane, when they were applied at different times and rates during the froghopper infestation period. Three experiments were carried out under field conditions. Best control was obtained with aldicarb 150G 10kg/ha and carbofuran 100G 25kg/ha, applied in November. When the insecticides were applied in December or January, the efficiency was reduced, especially that of thiamethoxam, probably because the great rain volume after applications contributed to the insecticides leaching, reducing the absorption by the roots. The insecticides aldicarb 150G, carbofuran 100G and thiamethoxam 250WG, applied in December, produced the best insect control, higher stalk production and higher sugar yields, in comparison with aplication in January at 40% lower doses. The control of the the root froghopper, made untill December, resulted in yield increase. When the insecticides were applied in January at lower doses, some of them reduced pest infestations, but did not contribute to increased yield, probably because the root froghopper had already damaged the plants irreversibly.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Leila Luci Dinardo-Miranda

Research topic(s) for pests/diseases/weeds:
control - general
damage/losses/economics

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Mahanarva fimbriolata	Sugarcane (Saccharum officinarum)	Brazil (south)