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THE LIFE HISTORY OF THE CITRUS NEMATODE TYLENCHULUS SEMIPENETRANS COBB 1) BY S. D. VAN GUNDY University of California Citrus Experiment Station, Riverside, U.S.A. The citrus nematode was first discovered in California by J. R. HODGES, horticultural inspector, and was reported in some detail by THOMAS (1913). That same year COBB (1913) studied this nematode and placed it in a new genus and named this species Tylenchulus sevvti- penetrans on the basis of position in the root. The following year COBB published a description of the development and structure of the nematode. He described the following life stages: mature females and males, first-stage larvae, and second- or third-stage females. Mea- surements of the eggs were first reported by CARVALHO in 1942. He also indicated that the measurements of males, females, and larvae by COBB (1913) were too large. The molt in the egg, two types of larvae, and pre-parasitic fetnales were described by GUI'IERREz. in 1947 2). The citrus nematode is known to occur in all the citrus-growing areas of the world. In a survey of California citrus groves, 02% of the groves examined were found to be infested (SPEARS 1956). BAINES et al (1952, 1954, 1957) reported
Nematologica – Brill
Published: Jan 1, 1958
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