CHE REFERENCE LIBRARY - Pole Shift Survival Information

CERTAIN ELEMENTS IN NURSERY PRACTICE 199
fungus Cocco~~nyces /zie7r&is, and a similar fungus causes the
yellow-leaf or shot-hole of plum. The fungus produces masses
of spores that appear as small, white, velvety pustules on the
undersides of the leaves, opposite the discolored spots. These
spores are produced throughout the summer and being carried
by wind and rain to other leaves cause new infections. The
fungus lives over winter in the fallen leaves on the ground, and
in the spring spe4al fruiting bodies (ascocarps) develop in
they old leaves. Spores discharged from the ascocarps pro-
(1u~ t!le first infections that appear on the new foliage.
hi trd. ---.- I, ime-sulfltr solution 1 to 50, or a dust mixture
of !G pa”‘ts filH?l)’ ,grourltl sulfur to 5 parts powdered lead arsenate,
i.; &‘c&ve for the control of the yellow-leaf disease.
‘1’1~ first application should be made when the first-year buds
WC about six to ten inches high. As a rule, five to seven
:qq4i&ons at inter\-& of about two weeks are sufficient.
An attempt should be made to keep as much as possible of the
foliage protcc.tctl throughout the summer. It is usually not
necessary to treat m>-rob&n plum seedlings or the Japanese
varieties of plums sincbe the yellow-leaf disease seldom causes
111UCll tlillUage Oil tllWt& trees.
~'~~IVI'DERT-MILDEW cw CHERRY. - The mildew of cherry can
bc recognizt4 1,~ the &aracteristic upward rolling of the foliage,
actc~orklI.““~i~‘(1 by a shortening and an increased thickness of
the internodes of the twigs. The curled leaves are covered
011 tllch ullcler S\lrftl(‘t with a txngle of white felt-like threads.
I ‘sutJly ;lfter miclsummer, small black specks ma,y be observed
sc~attorrJ OYW the surf~e of the felt-like mass on the underside
of tlw ltd. ‘l’hc &3x is fht3 work of the fungus PodospA@rU
cr.~~~frc~c~rrtIlrr~.
(‘r~f~l. -- The trea.tments for the yellow-leaf disease of
dltW~~ id plwn are also suficient for the control of the
mildr~w.