CHARACTERISTICS OF THE DISEASE. 47 



summer and fall very readily. Jarring causes them to fall by the hundred, 

 as if it were autumn. Very often they are blotched, browned, and dead 

 in places, especially at the ends and margins, from the attacks of various 

 leaf fungi. The younger and central leaves of the rosette remain small 

 and green and free from fungi. They are usually somewhat folded, but 

 seldom rolled. As summer advances these rosettes dry up and die un- 

 der the attacks of Scolytus rugulosus or from the effects of the disease. 

 The foliage of some affected trees is much greener than others. Gen- 

 erally the prevailing color from a distance is yellowish green or oliva- 

 ceous. The bunching of the leaves is conspicuous and makes the trees 

 noticable at a long distance. There is not enough foliage to give shade 

 or hide the branches. 



(c) Flowers and fruits. So far as I can determine by inquiry, the 

 trees which developed this disease in 1891 in Mr. Husted's orchards 

 did not blossom in advance of other trees, but were somewhat tardy. 

 On the contrary, other trees in the same orchard, imported from New 

 Jersey and affected with an entirely different disease, and what appears 

 to be genuine yellows, blossomed ten days in advance of the proper 

 time. 



Trees attacked by rosette generally drop their fruit early and while 

 it is still green or yellowish green. In June, 1891, 1 saw scattering 

 fruits on many diseased trees, and none of them were premature or bore 

 any of the characteristic symptoms of peach yellows. The fruit, even 

 on badly affected limbs, when there was any at all, was small, green, or 

 yellowish green, and often more or less shriveled. Fruits of this kind 

 were also common on the ground under such trees. Plate xxxm shows 

 two peach twigs bearing green fruits ; the right-hand figure was from 

 the healthy-looking side of a tree, the left-hand one from twigs just 

 beginning to develop rosettes, and very close to branches bearing thor- 

 oughly diseased and very typical rosettes. Its own buds were also 

 pushing into rosettes above the fruit and below. One yellowish green 

 shriveling fruit remained and another had fallen. In one instance the 

 disease was observed in Alexanders which were full of ripening fruit 

 and affected by the rosette only on about one-half of the limbs. 

 Most of the fruit had already fallen from the diseased limbs, green 

 and shriveled, but a few peaches remained on the healthier portions, 

 and these, like those on the other limbs, were neither premature nor 

 red-spotted, but were ripening at the proper time and in the normal 

 manner. The diseased branches bore hundreds of yellowish rosettes; 

 the healthy ones bore an abundance of dark green, handsome foliage. 



My .search for premature fruit was the more careful because I had 

 ventured the assertion that it would, no doubt, be found to precede the 

 rosette. In one or two instances only, I heard of premature peaches, 

 but on examination they were clearly attributable to borers and not 

 the sort produced by yellows. In one orchard where the borers had 

 been left undisturbed for several years, I saw fruits prematuring on 

 many trees, but there were no symptoms of yellows. The color and 



