‘Thornfree’ Blackberry in Illinois
DOI:
https://doi.org/10.71318/apom.1970.24.3.51Abstract
'Thornfree,' a semi-upright thornless blackberry, was introduced in 1966 by D.H. Scott and D.P. Ink, Crops Research Division, U.S. Department of Agriculure, Beltsville, Maryland. The cultivar has been outstanding in Illinois tests for several years, beginning with a planting as a selection in 1964.
Performance data from plantings established in 1965 at the Pomology Research Center, Urbana, and at the Dixon Springs Agricultural Center (DSAC), Simpson, are summarized in Table 1. The yields are averages of 5 plants spaced 4 feet apart in rows 6 feet apart at Dixon Springs and 6 feet apart in rows 10 feet apart at Urbana, all trained to a 2-wire vertical trellis. A sawdust mulch was used at Dixon Springs. The canes over-wintered on the ground each year at Urbana and in 1966 at Dixon Springs. In 1967 and 1968 the canes remained tied to the trellis throughout the winter at Dixon Springs.
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