. Fig. 44.—Spores of peacli-vust fungus, enlarged about 800 times. this disease, which usually starts soon after the fruit is set. Spraying with lime-sulfur for control of brown rot or twig borer (see "Brown Rot," p. 85 and table 4) may be of some value in mildew prevention. In places where mildew is bad, this may be followed as soon as the fruit is set with lime-sulfur 1-100 to which is added 6 pounds of wettable sulfur (p. 160). This spray may be repeated every 10 to 14 days as long as it seems necessary, or the trees may be dusted with dry sulfur as for brown rot. Such application
. Fig. 44.—Spores of peacli-vust fungus, enlarged about 800 times. this disease, which usually starts soon after the fruit is set. Spraying with lime-sulfur for control of brown rot or twig borer (see "Brown Rot," p. 85 and table 4) may be of some value in mildew prevention. In places where mildew is bad, this may be followed as soon as the fruit is set with lime-sulfur 1-100 to which is added 6 pounds of wettable sulfur (p. 160). This spray may be repeated every 10 to 14 days as long as it seems necessary, or the trees may be dusted with dry sulfur as for brown rot. Such applications of sulfur will help to prevent rust and brown rot of the friiit. Root-Knot Nematode.—Badly affected trees are stunted and the finer roots are covered with small, roundish galls or swellings. The peach root is very susceptible to this common pest, Heterodera marioni, an eel- w^orm which flourishes in the sandy type of soil often devoted to this fruit. Tests by the Division of Pomology have shown that the apricot root is less susceptible than the peach to nematode attacks. Even more valuable is the discovery of certain peach types which are resistant. More specific
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