DESCRIPTION AND SEM OBSERVATIONS OF MELOIDOGYNE-CHITWOODI N-SP (MELOIDOGYNIDAE), A ROOT-KNOT NEMATODE ON POTATO IN THE PACIFIC NORTHWEST

  • 1 January 1980
    • journal article
    • research article
    • Vol. 12  (4) , 319-327
Abstract
M. chitwoodi sp. nov. is described and illustrated from potato (Solanum tuberosum) originally collected from Quincy, Washington, USA. This new species resembles M. hapla (Chitwood), but its perineal pattern is basically round to oval with distinctive and broken, curled, or twisted striae around and above the anal area. The vulva is in a sunken area devoid of striae. Vesicles or vesicle-like structures are present in the median bulb of females. The larva tail, being short and blunt with a hyaline tail terminal having little or no taper to its rounded terminus, is distinctively different from M. hapla. SEM observations revealed the nature of the perineal pattern and details of the head of larvae and males, and showed the spicules to have dentate tips ventrally. Hosts for M. chitwoodi include potato, tomato, corn and wheat but not strawberry, pepper or peanut. The latter 3 crops are excellent hosts for M. hapla. The known distribution of this new root-knot species presently involves certain areas of Idaho, Washington and Oregon. The common name ''Columbia root-knot nematode'' is proposed for M. chitwoodi.

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