The Peach Replant Problem in Ontario: V. The Relation of Parasitic Nematodes to Regional Differences in Severity of Peach Replant Failure

Abstract

Peach production in Ontario is largely restricted to the Niagara Peninsula and Essex County, areas that are separated by some 200 miles but have a similar climate. The peach replant problem has been much more serious in Essex County than in the Niagara Peninsula. A survey of mature peach orchards showed that Pratylenchus penetrans (Cobb, 1917) Sher & Allen, 1953, is considerably more prevalent in peach soils in Essex County than in the Niagara Peninsula. In both areas, orchards that had a previous history of the replant problem had three to four times greater soil population of P. penetrans than those with no such history. Soils of finer texture were shown to limit the populations of P. penetrans, and the relatively low numbers of this nematode in the Niagara Peninsula appear to result from the influence of the finer soils prevailing in that region. The effect of different soil-particle sizes on the build-up of P. penetrans may explain the distribution of the peach replant problem in Ontario.

Inhibition of ^|^beta;-Cyanoalanine Synthase Activity by Growth Inhibitors from Peach Roots

“…However, causes for peach replant prob lems have been studied from many different points of view such as nematodes (15,16,17), fungi (22, 23) and allelopathins (6,8,10,13,14,18,19,20). Therefore, it seems most reasonable that while in some cases a certain single factor may be predominant, in other cases other factors may complicate the problems.…”

The Short Life and Replant Problems of Deciduous Fruit Trees

“…Most peach replants dying are those established on locations of previous peach trees. Mountain and Boyce (1958a) found three to four times greater soil populations of Pratylenchus penetrans in soils with previous peach history than in those with no such history of peach production. Similarly, repeated croppings with apple andcherry were found toaffect their respective specific replant diseases (Pitcher et al 1966).…”

Etiology and control of orchard replant problems: a review

“…Apple replant diseases in Northeastern U.S.A. (Parker & Mai 1974) and the Pacific Northwest (Benson et al 1978) have received considerable attention, as have replant problems in peach (Chandler 1969, Gilmore 1959, Hewetson 1957, Mai & Abawi 1981. In Canada, peach replant problems have been a concern since the 1930s with much of the work having been done in Ontario (Upshal & Ruhnke 1935, Koch 1955, Mountain & Boyce 1958a, Mountain & Patrick 1959, Patrick & Tousson 1965, Wensley 1956). Replant problems of apples in Canada have also received attention in Nova Scotia (Ross & Crowe 1973, British Columbia, Ontario, and Quebec.…”