. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). TiiK Control of Ixskct Pests and Plant DLsiiL<\si;s. 609 pletely controlled by spraying the trees once, before the buds swell, with Bordeaux, 5-5-50, or with the lime-suh'ur mixtures used for San ]os6 scale (see under fungicide, page 500). Cornell Bulletin 276. Yellows is a so-called "physio- YellowS. logical ; Cause un- known.
. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). TiiK Control of Ixskct Pests and Plant DLsiiL<\si;s. 609 pletely controlled by spraying the trees once, before the buds swell, with Bordeaux, 5-5-50, or with the lime-suh'ur mixtures used for San ]os6 scale (see under fungicide, page 500). Cornell Bulletin 276. Yellows is a so-called "physio- YellowS. logical ; Cause un- known. Contagious and quite serious in some localities. Known by the pre- mature ripening of the fruit, by red streaks and spots in the fruit liesh and by the peculiar clusters of sickly, yellowish shoots that appear on the limbs here and there. Eradication is the only means of control. Dig out and bum diseased trees as soon as Fig. 217. Black-spot on peach. Fire-blight. Scab. Fig. 218. PEAR. This is the same as fire-blight of apple but it is more destructive to pears. It kills the twigs and branches on which the leaves suddenly blacken and die but do not fall. It also produces cankers on the trunk and large limbs. Prune out blighted branches as soon as discovered, cutting 6 to 8 inches below the lowest evi- dences of the disease. Disinfect with corrosive subli- mate solution, I to 1000. Clean out limb and body cankers as described for fire-blight on apple trees, Disinfect all large wounds and cover with coat of paint or gas tar. Cornell Bulletin 272. Plant the varieties least affected. Scab is a fungous disease very similar to apple scab, but it is not the same. It is very destructive to some vari- eties, as, for example, Flemish Beauty and Seckel. Spray three times with lime-sulfur, 1-50 (32® Beaum^), or Bordeaux, 3-3-50, as for apple scab (page 486). Cornell Bulletin 145 and Geneva Bulletins 67 and 84. PLUM. This is the same disease as black-knot of cherries and is co
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