436 OHIO EXPERIMENT STATION: BULLETIN 214 
America. It was discovered upon potatoes from upper Hungary in 1896 and 
has since become distributed over much of northern Europe including Germany, 
England, Ireland, Scotland and Wales. Apparently this wart disease is the 
most serious potato trouble yet met with in cultivation, since it causes large 
warts upon potatoes but partially infected and converts those badly attacked 
into corky masses not unlike lumps of coke. Such tubers are entirely unfit for 
human food though they may be used for stock food after cooking. The fungus 
causing the disease survives in the potato by resting spores as well as by its 
vegetative parts and appears to remain as a soil infestation for five to six years. 
Seed treatment is not effective in controlling the disease. Every effort should be 
made to secure the exclusion of the disease from the United States and to’ 
recognize it should imported tubers carry the trouble. See Giissow, Bulletin 63 
Central Experimental Farms (Ottawa) and Orton, Circular 52, Bureau Plant 
Industry 1910. 
PRIMULA 
Rot. <A rot of Chinese primula due to Botrytis and similar to that on peony 
has been reported and may be expected with us. 
PRIVET 
Anthracnose. Privet in hedges is frequently attacked by anthracnose 
(Gloeosporium cingulatum Atk.). This shows itself by lesions in the younger 
stems and results in dying of the portions of the attacked branches beyond the 
lesions. This weakens the hedge and sometimes results in‘ secondary conse- 
quences. While spraying has not been fully worked out for this disease, it 
should prove an effective remedy at the proper time. 
PUMPKIN 
Downy Mildew and Wilt attack pumpkins after the manner described under 
muskmelon and cucumber. The remedies are the same as there stated. 
QUINCE 
Anthracnose. The fruits and possibly the branches of quince are attacked 
by an anthracnose fungus(Glomerella rufomaculans Sp. & V. Schr.)which is the 
same as that causing bitter-rot in apple. According to our knowledge of the 
survival of this fungus, attention must be given to gathering and burning of 
“mummy’’ fruits and to the cankers produced, if any, upon the branches. The 
spraying treatment necessary is the same as that for apple bitter-rot. 
Black-Rot. The fruit and foliage of the quince are attacked by black-rot. 
The black-rot multiplies very rapidly in the fruit of quince and often causes loss 
of much of that produced. This fungus (Sphaeropsis malorum Pk.) also develops 
as a leaf-spot upon the foliage causing defoliation. It is liable to attack the 
branches after the manner determined for apple. Tohold this fungus in check 
very careful spraying is required at times, but as a rule it is easier to keep down 
the black-rot on fruit and foliage of quince than to keep it down on susceptible 
apples. The spray used is Bordeaux mixture. 
Leaf-Spot of another kind which is identical with that upon pear is found at 
times formed upon the quince. It is controlled by the same treatment as the 
black-rot. 
Blight. The blight upon quince (Bacillus amylovorus (Burr.) De Toni.). is 
slightly less destructive than that upon pear. It is caused by the sane bacterium 
and requires the same watchful care and attention as in the case of pear. 
Pale-Rot. This (Phoma cydoniae Sacc.) is reported from some of our states 
and may occur fn Ohio. There is no evidence to indicate that it will require 
more prolonged treatment than black-rot or leaf-spot. 
