Horticultura Brasileira (2003) 21, 464-467

Francisco Roberto de Azevedo and Ervino Bleicher (2003)
Distribuição vertical e setorial das ninfas de mosca-branca nas folhas do meloeiro
[Vertical and sectorial distribution of whitefly nymphs on melon leaves]
Horticultura Brasileira 21 (3), 464-467
Abstract: The spatial nymphs distribution of Bemisia argentifolii Bellows and Perring (Hemiptera: Aleyrodidae) among and within melon leaves was observed. The vertical distribution among leaves was done, selecting randomly leaves from node 5^th through 20^th. The counting of nymphs was performed on a weekly basis, at 49; 56 and 63 days after planting, using a circular leaf disc with an area of 2.8 cm². Higher nymph concentration was observed from the 8^th to the 10^th leaf counted from the top to the bottom of the melon plant. These leaves were considered the best ones to be sampled. The distribution of nymphs over the leaf sectors was performed, selecting randomly leaves and dividing them into four sectors (distal left, proximal left, distal right, and proximal right). The number of nymphs was similar in both proximal sectors, however in the proximal sectors the number of nymphs was greater than those found in distal sectors. From the total nymphs found, 13.70% were found on distal left sector, 35.70% on proximal left sector, 36.70 on proximal right sector and 14.25% on distal right sector. Sampling nymphs close to the central leaf rib is more effective.
(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:
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci biotype MEAM1	Melon (Cucumis melo)	Brazil (NE)