Abstract
The sugar-beet nematode, Heterodera schachtii Schm., produced five generations in one growing season in the Imperial Valley of California where sugar-beets are planted in the fall, grown through the winter, and harvested the following April, May or June. Encysted eggs survived 3 months' summer fallow in surface soils in which temperatures as high as 52° C were recorded. In a controlled temperature test maximum reproduction of H. schachtii occurred at 27.5 ° C. Reproduction at 27.5° C was twice that at 25° C. Only a few females formed at 30° C and no development occurred at 32.5° C. A population of H. schachtii from the winter beet area (Imperial Valley) and one from a summer beet area (Orange County) did not differ in their response to soil temperature.
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