Journal of Nematology (2005) 37, 397-398

J.B. Sumner and E.C. McGawley (2005)
Egg biology and reproduction of Rotylenchulus reniformis isolates from the southern United States
Journal of Nematology 37 (3), 397-398
44th Annual Meeting, Society of Nematologists, Fort Lauderdale, Florida, 9-13 July, 2005
Abstract: Rotylenchulus reniformis (Rr) is a serious nematode pathogen in the United States. Differences in reproduction, cultivar response and host preference among geographic isolates of the nematode have led to the hypothesis that distinct pathotypes exist in nature. Populations of Rr from LA, MS, AR, TX, and HI were used to evaluate egg hatch in water and in soil in the presence and absence of host roots, as well as numbers of egg masses per root system and numbers of eggs per egg mass. Over the course of two preliminary trials, hatch of eggs of Rr isolates from 10 major cotton-producing parishes of LA were determined in soil and in water. In the first trial, the percent egg hatch in water and soil, respectively, averaged 90% and 93% for the Catahoula parish isolate and 58% and 45% for the Avoyelles isolate. In trial two, the Opelousas isolate had the highest percent egg hatch, which was 91% in water and 94% in soil. The Evangeline isolate had the lowest percent egg hatch in water, which averaged 58. The Avoyelles isolate had the lowest percent egg hatch in soil, which averaged 57. Additional egg hatch trials with isolates of Rr from LA, TX, and other southern states were conducted using a temperature range from 23° to 32°C. In 2004, new isolates of the nematode were obtained, and 10 to 20 single egg mass cultures of each were established in the greenhouse for evaluation of within-isolate differences in reproduction and pathogenicity. Results of these studies show minimal variation among single egg mass cultures from the same geographic isolate.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Rotylenchulus reniformis		U.S.A. (Hawaii)
	Rotylenchulus reniformis		U.S.A. (mid S)