About
  PDF
Full Text
(92 K)

The Effects of Fungicides on Phomopsis Boll Dangle Incidence and Severity

Boyd Padgett and Jason Price


 
ABSTRACT

Field tests were conducted in 1999 and 2000 to evaluate the effects of fungicides on Phomopsis boll dangle (PBD). Phomopsis boll dangle epidemics were monitored in Sure-Grow 501 and Phytogen 355 in 1999 and 2000, respectively. Foliar broadcast sprays of Quadris 2.08SC (12 fl oz/A) plus Bravo Weatherstik 6F (1.5 pt/A) or Benlate 50WP (1 lb/A) plus Bravo Weatherstik 6F (1.5 pt/A) were applied weekly beginning at or before boll initiation and continued until harvestable bolls were 20 to 24 days old. Beginning in late July and continuing until mid-August, PBD incidence (percent affected plants) and PBD severity (number of affected bolls per plant) were monitored weekly. PBD incidence and severity was not reduced by either fungicide combination compared to the non-treated cotton. In 1999, incidence ranged from 4.6% to 17.6% during the rating period. Severity ranged from 0.09 bolls per plant to 0.19 bolls per plant in 1999 and 0.5 bolls per plant to 0.81 bolls per plant in 2000. Lint yields from plots treated with fungicides did not differ from the non-treated. PBD was not a problem in the varieties evaluated under the environments experienced in 1999 and 2000. However, further research is necessary to determine if specific environmental conditions could cause PBD to negatively impact cotton yield.





Reprinted from Proceedings of the 2001 Beltwide Cotton Conferences pp. 134 - 137
©National Cotton Council, Memphis TN

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page
 
Document last modified XXXXXX, XXX XX 2001