396 OHIO EXPERIMENT STATION: BULLETIN 214 
Knot. This fungus (Pleonectria berolinensis, Sacc.) is a stem trouble of cur- 
rants and calls for investigation. It has been collected in this state. 
Leaf-Spot of currants is referable to two species of fungi (Septoria ribis 
Desm.; Cercospora angulata Wint.) of which only the Septoria has been dis- 
covered in Ohio. (See Bulletin 79), These fungi produce early spotting and pre- 
mature dropping of the currant foliage; in some instances the leaves drop even be- 
fore the fruit has ripened. Bordeaux mixture applied as per calendar is effective 
against this disease, though late applications may render it necessary to wash 
the fruit. For this reason, if for no other, the first application should be made 
very early and followed by about two more at fortnightly intervals. : 
Rust. A rather common rust fungus (Puccinia ribis DC) has been discovered 
upon currant. Warning has been recently sent out against a second fungus 
(Cronartium ribicolum Dietr. Peridermium strobit Kleb.) which attacks the 
seedlings of white pine in the aecidial stage, and passes its uredo and teleuto 
stages upon leaves of currants and gooseberries. This fungus is to be sought 
for with care since its occurrence in the United States may have much to do with 
the success of forest plantings of white pine. 
Powdery Mildew of gooseberries (Sphaerotheca mors-uvae (Schw.) B.&C.) 
sometimes attacks currants where it is apparently less destructive than on 
gooseberry. Reasonable spray treatments should control it. 
DEWBERRY 
Leaf-Spot. (Septoria rubi West.) Cultivated dewberries as well as the wild 
sorts, are peculiariy susceptible to the attacks of the leaf-spot fungus. It causes 
very small grayish spots inthe leaves. The same fungus attacks blackberries 
and raspberries, as previously stated. It may be prevented by a careful appli- 
cation of Bordeaux mixture. 
Rust. The bramble rust also attacks the dewberry as in the case of ttack- 
berry. For treatment see blackberry. 
EGG-PLANT 
Anthracnose. The anthracnose fungus of egg-plant (Glocosporium melongenae _ 
Ell. & Hals.) attacks the fruits of egg-plant and causes spots in them. ‘This ; 
occurs frequently in Ohio. These show early as pits in the surfaces of the fruit 
which show the usual border. 
Bacterial Blight. The common solanaceous blight organism (Bacterium 
solanacearum Erw. Sm.) attacks the egg-plant as well as the potato and 
tomato. Where attacks occur destruction of the affected plants is all that can 
be done. 
Fruit-Rot. A fruit-rot of egg-plant likewise occurs and may at times appear 
as a leaf-spot fungus. This, like the anthracnose and leaf-spot, should yield to 
treatment by sprays. Ammoniacal copper carbonate may be used tow2rd the 
ripening period. 
Leaf-Spots. Two or more leaf-spot fungi have been recorded on egg-plant 
and will doubtless be found when sought. 
Stem-Rot. The stem-rot fungus of sweet potato (Vectria ipomoeae Hals.) has 
been described upon egg-plant by Dr. Halsted. The conidial stage is evidently 4 
species of fusarium and it may or may not be a different one from that with 
which we have to contend upon the potato; it is recorded by Dr. Halsted as the 
same that occurs on sweet potato. 
