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77 > Image 77 of Annual report. 1908

Part of Kentucky Agricultural Experiment Station

r 5,4 J Bulletin N0. 138. t The parasitic fungus (Sphtwmsiilbe coccophlla) believed to de- I y stroy the scale in Florida has been observed in Kentucky on San ? Jose Scale from Kenton County, and on a related species (Aspidl- ` y otus aww) attacking grape in Clark County. r - The lime-sulphur-salt wash, recommended in our Bulletin No. E y 110, still remains the most satisfactory remedy that has been tried _ in Kentucky. Soap solutions have been used with good effect, and V if persisted in can be made to keep orchards in profitable condi- rg tion. They do not last as long as the lime-sulphur-salt wash, and { ` . as neither can be applied during the summer, the advantage is with Y A A V the more lasting wash. . The biting properties of the limesulphur-salt wash are very is 4 much against it in the estimation of some who have used it, but others greatly prefer it in spite of this unquestioned defect. It becomes less caustic if the salt is omitted. . THE OYSTER-SHELL BAQRKLOUSE. _A (Mytilaspis pomorum). _ This scale is one of the largest of those occurring on apple _ trees, and is easily recognized with a magnifier by its peculiar A shape. As the name implies, it looks very much like the half of ` a very minute oyster shell, with a slight twist. The surface of the V scale is quite convex from side to side and sometimes glossy, and the length several times the diameter. The color is brown. The insect belongs to the same family as the San Jose scale, but is A larger. i As in the San Jose scale, the shell-like part visible is largely a secretion serving for the protection of the insect beneath. The l _ insect differs from the San Jose scale in its manner of producing young. The oyster-shell barklouse lays eggs and during the winter I they may be found beneath the scales. The young hatch in April i V or May and at least two broods develop during a season. The insect is most often found on apple, but attacks pear, and is some- times found on willow. I It has not thus far proved very common in Kentucky, though r occasionally seen on one or two nursery trees, and is sometimes i ` sent to me by correspondents. ln other parts of the country it l