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United States Department of Agriculture

Agricultural Research Service

Title: 1995 Reniform Nematode-Silverleaf Whitefly Interaction Study

Authors
item Cook, Charles
item Wolfenbarger, Dan
item Namken, L - TAMU EXP. STA. - WESLACO

Submitted to: Texas Agricultural Extension Service Regional Report
Publication Type: Experiment Station
Publication Acceptance Date: November 15, 1995
Publication Date: N/A

Interpretive Summary: Both the reniform nematode (Rotylenchulus reniformis) and the silverleaf whitefly (Bemisia argentifolii) are known to be potential yield-reducing pests to cotton (Gossypium hirsutum) production in the Lower Rio Grande Valley of Texas. In 1995, a field study was conducted at the USDA North Farm, Weslaco, Texas, to determine and quantify the effects of the reniform nematode and silverleaf whitefly on lint yield. The results indicated that on the average, reniform nematodes reduced total yield by 45%, while the silverleaf whitefly reduced yield by 39%. The most severe yield reductions were observed in the second harvest, indicating that as the season progresses, these pests appear to cause more damage, especially if the pests attack the plant simultaneously. The late season yield reductions that the reniform nematode and silverleaf whitefly appear to cause demonstrated the importance of managing for an early crop, as well as the need to use cultural practices that reduce or avoid these pests.

Technical Abstract: Reniform nematodes (Rotylenchulus reniformis) can be a serious yield-reducing pest in many cotton (Gossypium hirsutum) producing areas of the Lower Rio Grande Valley of Texas, with typical symptoms being stunted and unhealthy appearing plants. Likewise, feeding damage by the silverleaf whitefly (Bemisia argentifolii) can result in severe plant stress, reduced yields, and lint contamination with honeydew associated fungi. In 1995, the effects of the reniform nematode and silverleaf whitefly on cotton was evaluated at the USDA North Farm, Weslaco, Texas. The results indicated the potential yield losses that the reniform nematode and silverleaf whitefly can cause. On the average, reniform nematodes reduced total yield by 45%; whereas, whitefly infestations appeared to reduce yield by 39%. The greatest yield reductions were realized in the second harvest, indicating that these pests may severely reduce the yield potential of the plant as the season progresses, especially if the pests attack the plant simultaneously. The deleterious late season effects that the reniform nematode and silverleaf whitefly appear to cause demonstrate the importance of managing for an early crop, as well as the need to use cultural practices that reduce or avoid these pests.

Last Modified: 12/20/2014
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