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Regression models were developed to predict relative abundance of annual broomweeds on a Texas rangeland as a function of selected climatic factors. Based on 16 years' data, above-average precipitation in May and below-average daily maximum temperatures in April were the principal climatic factors most closely associated with heavy infestations of annual broomweeds for any given year (R? = 0.902). Similar models developed from bimonthly and trimonthly averages were less precise than monthly averages for predicting relative abundance of annual broomweed. Common broomweed [Xanthocephalum drancunculoides (DC.) Shinners], roundleaf broomweed (X. sphaerocephalum (Gray) Shinners vars. sphaerocephalum*, and Texas broomweed (X. taxanum (DC.) T. and G.] comprise an annual broomweed complex indigenous to most rangelands of Texas (Gould 1975). Heavy infestations of mature annual broomweeds can seriously reduce forage production and utilization by livestock (Rittenhouse et al. 1978). Scifres et al. ( 1971) studied the annual phenological development of common broomweed from College Station to Spur, Texas, from 1968 through 1970. During these 3 years, phenological progression was quite similar regardless of study Author is assistant professor of range science. Texas AM Jones et al. 1977; Beck and Sosebee 1975), only limited data are available to facilitate prediction of those years when dense annual broomweed stands will occur. It has generally been hypothesized that moist, mild falls and winters followed by wet, cool summers are conducive to heavy annual broomweed infestations (Rittenhouse et al. 1978). The objective of this study was to evaluate the relationships between selected climatic factors and annual broomweed infestations in Texas rangelands.

Relative Annual Broomweed Abundance As Related to Selected Climatic Factors