RT Journal Article SR Electronic T1 Response of ST. George Rootstock Vines to Summer Irrigation and to Treatments with the Nematocide DBCP JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 55 OP 60 DO 10.5344/ajev.1967.18.1.55 VO 18 IS 1 A1 L. A. Lider A1 A. N. Kasimatis A1 R. V. Schmitt YR 1967 UL http://www.ajevonline.org/content/18/1/55.abstract AB Basin irrigation was applied at monthly intervals to blocks of St. George rootstock vines growing at Oakville, and the vines were compared with unirrigated vines. In 1964, concentrations of a fumigant, 1,2-dibromo-3-chloropropane (DBCP) at 10 to 200 ppm were added to other irrigation treatments to test nematode control. These treatments were evaluated by weighing the top growth of the vines at the end of the first and second growing seasons, by noting the effects on budding success, and by soil sampling to determine nematode levels.As compared with unirrigated vines, one irrigation in either June, July or August doubled the amount of top growth. Addtional irrigations enhanced growth further, though not as much as the single irrigation.DBCP at 30 ppm or less enhanced vine growth only slightly. DBCP at 100 ppm or more resulted in vine stunting, and leaf chlorosis. Though the population of plant-parasitic nematodes was not high, numbers of larvae were reduced markedly with the lower rates of DBCP; none were recovered from the plots that received 150 ppm or more.The degree of success in fall-budding the rootstock vines was less with the unirrigated vines than with vines that received one or more irrigations. DBCP at 30 ppm or less had no effect on budding success. Though considerably less than in the first year, vine growth during the second year without further treatments still reflected the stimulus given the vines by irrigation the previous year.