Grape Growing in Florida


side of the leaves with the spray materials, especially during
the first applications of the season.
 Anthracnose, Sphaceloma ampelinum De By., sometimes called
"bird's-eye rot", is very destructive to all varieties that are high
in vinifera parentage. It is characterized by attacking the young
growth, causing black sunken areas on twigs and tendrils. On
leaves the spots are black, often surrounded by a whitish rim
and frequently the center falls out. Spots on the fruit at first
are usually brown, surrounded by a narrow, dark-purplish mar-
gin. As they increase in size they become lighter in color and
somewhat sunken. The affected fruit does not become soft,
but shrivels slightly and becomes hardened. Often, as with some
other diseases, the seeds protrude from the affected area.
 Anthracnose may be controlled by spraying with bordeaux at
frequent intervals during the period of early vine growth.
 LEAF DISEASES
 Diseases which attack the leaves are very serious in their
effects if allowed to develop unhindered. The principal or-
ganisms which have been found associated with these are Isari-
opsis clavispora (B. & C.) Sacc., Alternaria sp., Pestalozzia sp.
and the imperfect stage of the black rot organism Phoma uvicola
B. & C.

















 Fig. 13.-An unsprayed vine of Florida Beacon, showing vine nearly defoliated and fruit
 exposed to sunburning. (Photo taken June 10.)

 Tests have shown that leaf diseases are very well controlled
 if the vineyard is sprayed according to the schedule for con-