CHE REFERENCE LIBRARY - Pole Shift Survival Information

200 TllE NIJRSERY-MANIJAL
&ITIRACNOSE OF CURRANTS AND ~OSEI;IERRIES.- The
anthracnose disease often causes heavy defoliation of nursery
stock early in the season. Usually
the currants are more severely affected
than the gooseberries.
I)P.wriptifm. - The disease appears
on the leaves as small circular spots,
dark brown in color and about one
twenty-fifth of an inch in diameter
(Fig. 311). Severely afk’ected folkge
soon turns yellow and falls prematurely.
ltlw:wI~cm of ~‘(f121~se. - The disease is caused by
cTlrr:1111.
the fungus I’~mdopf3kr. ribis. Spores
of the fungus are produced in the spots on the leaves a.nd
being carried by wind and rain to other leaves the spores
germinate and produce new infections. Special fruiting bodies
(apot.heeia,) of the fungus develop in the diseased leaves
which fall to the ground and these apothecia serve to bridge
the fungus OCR winter. In the spring, spores are produced
which affect the new foliage.
Control. --- Spraying the bushes with
lime-sulfur solution 1 to 40, or dusting
with a mixture of 95 parts finely ground
sulfur to 5 parts powdered arsenat.e of
lead, has pro~tl c#ective in controlling
the anthraciiose. It is advisable to
make the first application when the
leaves are unfolding and other applicutions
at intervals of ten to twenty days
until about five or six treatments have
Fru. 215. Septorin leafspot
of gooselxrry uxd
been made.
cwrarit~.
SEWORIA LEAF-SPOT OF CURRAN~~~ AND C~~HE~ERRIES.---
The septoria leaf-spot occurs on various species of Iiibes. It