DISEASES OF CULTIVATED PLANTS 407 
LILY 
¢ 
Lily diseases are frequent in all lily growing districts. With us no study 
has been made, as little complaint is made to us. Doubtless the chief factor is 
to secure healthy bulbs. 
LOCUST 
Heart-Rot (7rametes robiniophila Murr. and Fomes rimosus Berk.). In 
southern Ohio the locust is reported as suffering from a heart rot trouble, 
but to which of the several species occurring in different parts of the United 
States, we must ascribe most injury we are not yet able to decide. Both species 
occur in Ohio. The rot is described as infecting the heart of much of the trunk, 
so that trunks may be of no value above the first post length or less from base. 
The heart wood is converted into punk and the fungus fruits externally, as is 
commonly the case. 
LUPINUS 
Several species of lupinus are used for ornamental or other plantings and 
are liable to the same group of diseases as are found upon alfalfa, clovers and 
pea. 
MANGEL-WURZEL 
Mangel-wurzel being a near relative of the beet is liable to be attacked by 
essentially the same diseases as the garden beet. These are usually leaf-spot, 
rust, dry-rot, etc. 
MAPLE a 
Anthracnose. (Glocosporium apocrypitum E. & E.) This disease attacks 
young Norway maples (See N. Y. Sta. Report ’95) and has been also identified 
on the young shoots of sugar maples in Ohio. The new leaves were reported 
destroyed by the fungus which is much more common in Ohio on sycamore 
trees. Applications of Bordeaux mixture should check this disease. 
Rhytisma and Leaf-spot. The leaves of cultivated maples are often dis- 
figured by dark colored incrustations following the line of the veins. These in- 
crustations are almost black and are caused by a fungus, (Rhytisma acerinum 
(Pers.) Fr.) The trouble is usually not serious, but if prevalent it would seem 
advisable to gather and burn all leaves attacked by it. The leaf-spot fungus 
(Phyllosticta acericola (Cke. & Ell.) often causes small spots, or dead areas, in 
the leaves. This may sometimes prove so serious as to call for applications of 
fungicides. 
Mildew. Maple leaves are overrun by the powdery mildew fungus (Uucinula) 
at times, but this is not difficult to check even if spraying becomes necessary. 
Tip-Burn—Sun-Scald. Tip-burn conditions upon the maple in 1908 and 1909 
were similar to those described for horse chestnut and evidently due to 
secondary consequences of insect punctures. 
Sun-Scald or winter injury effects are frequent upon maples after the 
manner of those described for apples. They are due to a killing of unripened 
tissues by premature freezing and are only preventable by avoidance. 
