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Expression of Resistance in Peanuts to Pratylenchus brachyurus: Impact on Screening for Resistance

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Journal of Nematology
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Abstract

Expression of Resistance in Peanuts to Pratylenchus brachyurus: Impact on Screening for Resistance 404 Journal of Nematology, Volume 16, No. 4, October 1984 nematicide, D-D(1,2-dichloropropane- 1,3- dichloropropene), resulted in the greatest flowering with the controls giving the low- est (Table 2). The less effective nematicide, ethoprop (O-ethyl S,S-dipropyl phospho- rodithioate), had an intermediate effect on flowering. In these tests, flowering was pos- itively correlated with yield and negatively related to soil nematode populations and root-gall indices (Table 3). Infection by Meloidogyne species can have an important impact on the phenology of flue-cured tobacco. Flowering is delayed under moderate infection levels or com- pletely suppressed by high nematode in- fection. The tobacco cyst nematode, Glo- bodera solanacearum, also delays flowering of flue-cured tobacco in Virginia (John Ri- ley and Dean Komm, pers. comm.). LITERATURE CITED 1. Arens, M. L., andJ . R. Rich. 1981. Yield re- sponse and injury levels of Meloidogyne incognita and M. javanica on the susceptible tobacco 'McNair 944.' Journal of Nematology 13:196-201. 2. Barker, K. R., F. A. Todd, W. W. Shane, and L. A. Nelson. 1981. Interrelationships of Meloidogyne species with flue-cured tobacco. Journal of Nematol- ogy 13:67-79. 3. Barker, K. R., and W. W. Weeks. 1981. Influ- ence of soil type and Meloidogyne incognita on yield and quality of tobacco. Journal of Nematology 13:432 (Abstr.). 4. Garcia M., R., andJ. R. Rich. 1983. Efficacy of selected fumigant and nonfumigant nematicides to control Meloidogyne javanica in Florida tobacco. Ne- matropica 13:125-134. 5. Rich, J. R., and C. Hodge. 1983. Flowering response of flue-cured tobacco as influenced by Me- loidogyne javanica. Nematropica 13:119 (Abstr.). Journal of Nematology 16(4):404-406. 1984. © The Society of Nematologists 1984. Expression of Resistance in Peanuts to Pratylenchus brachyurus: I m pact o n

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