Neotropical Entomology (2002) 31, 441-444

Alexandre M. Cardoso, Francisco J. Cividanes and William Natale (2002)
Influência da Adubação Fosfatada - Potássica na Ocorrência de Pragas na Cultura da Soja
[Influence of phosphate-potassic fertilization on the occurrence of soybean insect pests]
Neotropical Entomology 31 (3), 441-444
Abstract: This study was developed to determine the effect of phosphate-potassic fertilization on the occurrence of soybean insect pests. Plots were arranged in a randomized complete block design in a 4 by 4 factorial experiment (four phosphate levels and four potassic levels) with three replications. The levels of phosphorus and potassic tested were, respectively: 0, 80, 120 and 160 kg/ha of P₂O₅ and 0, 40, 60 and 80 kg/ha of K₂O. The insect population survey was carried out on a weekly-basis starting from the V2 stage, using ground-cloth. The results showed a tendency of population growth of Piezodorus guildinii (Westwood) for the highest levels of nutrients. Some leaf nutrients were correlated with Diabrotica speciosa (Germar).

O estudo foi desenvolvido para se determinar o efeito da adubação fosfatada-potássica da soja sobre a ocorrência de insetos-praga. Os tratamentos constituíram um fatorial 4 x 4 (quatro doses de fósforo e quatro doses de potássio) com três repetições. Os níveis de fósforo utilizados foram, respectivamente (0, 80, 120 e 160 kg/ha) de P₂O₅ e (0, 40, 60 e 80 kg/ha) de K₂O. Foram realizadas amostragens semanais a partir do estádio V2 da cultura, utilizando-se pano de amostragem. Os resultados indicaram uma tendência de aumento populacional de Piezodorus guildinii (Westwood) para as maiores doses dos nutrientes. A ocorrência de Diabrotica speciosa (Germar) foi correlacionada com alguns nutrientes das folhas.
(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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Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Anticarsia gemmatalis	Soybean (Glycine max)	Brazil (south)
	Piezodorus guildinii	Soybean (Glycine max)	Brazil (south)
	Diabrotica speciosa	Soybean (Glycine max)	Brazil (south)