Variation in reproduction and pathogenicity of geographic Isolates of Rotylenchulus reniformis on cotton

Document Type

Article

Publication Date

12-1-2010

Abstract

The comparative reproduction and pathogenicity of isolates of Rotylenchulus reniformis from Alabama, Arkansas, Hawaii, Louisiana, Mississippi and Texas on cotton was evaluated in microplot trials. Prior to initiation of microplot trials, ten single-egg mass populations were derived from each geographic isolate. Reproduction of the populations of each geographic isolate was evaluated in greenhouse studies with Stoneville LA887 cotton by assessing the numbers of vermiform stages in soil and eggs per gram of root tissue 60 days after inoculation. On the basis of these trials, each repeated once, one population of each of the six isolates was selected for use in microplot trials. Averaged over the two trials, population designations selected for use in microplot trials and their respective reproduction values (R, where R = Pf/Pi) and numbers of eggs per gram of root were: AL-8 (R = 14.9, eggs = 202); AR-3 (R = 30.4, eggs = 525); HI-9 (R = 20.2, eggs = 183); LA-3 (R = 18.2, eggs = 517.); MS-7 (R = 25.7, eggs = 602) and TX-10 (R = 42.8, eggs = 938). Data from full-season (147 days) microplot trials, averaged over 2 years, showed significant differences (Tukey's HSD test (P ≤ 0.05%)) among isolates of reniform nematode in both reproduction and pathogenicity. Dry plant weight at harvest averaged 370.6 g for the non-inoculated control. All isolates except the one from HI produced root weights at harvest that were reduced significantly below that of the control. Harvest weights for plants inoculated with LA-3 and MS-7 were significantly lower than those from the other four geographic regions.

Publication Source (Journal or Book title)

Nematropica

First Page

275

Last Page

288

This document is currently not available here.

Share

COinS