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Life History of Hemicriconemoides Chitwoodi Esser

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For more content, see Nematology.

Studies on the developmental stages of Hemicriconemoides chitwoodi indicate that the life history involves only 3 complete larval molts; one occurring in the egg and two occurring in the soil. No evidence of a complete 4th molt could be found. Eggs are deposited singly in the 1-celled stage and second-stage larvae hatch in water in 14-19 days at 20-21° C. The cuticle of the third-stage larva is spined and each spine bears a minute seta about 1 μ long. Fully developed male and female adults, devoid of spines or setae, emerge after the third molt. The extra cuticle of sheath is produced at the last complete molt before the vulva of the adult is completely differentiated. The sheath may represent an incomplete fourth molt. Males lack a stylet and produce no extra cuticle or sheath. The occurrence of the spined third-stage larva presents evidence that H. chitwoodi is more closely related to the genus Criconema than to Criconemoides or Hemicycliophora.

Affiliations: 1: United States Department of Agriculture, Crops Research Division, Charleston, South Carolina, U.S.A


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