. Bulletin - New York State Museum. Science. Fig _ (Original) Adult of European elm case-bearer Ititeola Miill. The two species were abundant enough, so that the foHage in certain portions of the village was badly marked. The general result of injury by these forms is somewhat similar though easily separable. The areas mined by the case-bearer are markedly rectangular, being bounded on either side as a rule by a parallel vein and extending rather evenly for some distance from the central feeding hole which is easily seen when looking up toward a bright sky. The eroded, semitransparent, skeleto
. Bulletin - New York State Museum. Science. Fig _ (Original) Adult of European elm case-bearer Ititeola Miill. The two species were abundant enough, so that the foHage in certain portions of the village was badly marked. The general result of injury by these forms is somewhat similar though easily separable. The areas mined by the case-bearer are markedly rectangular, being bounded on either side as a rule by a parallel vein and extending rather evenly for some distance from the central feeding hole which is easily seen when looking up toward a bright sky. The eroded, semitransparent, skeletonized areas produced by elm leaf beetle larvae are at once recognized by their greater irregularity, the lack of the central feeding orifice and the fact that there is no min- ing of the foliage. This species, like the common cigar case-bearer on our fruit trees, should be easily controlled by early and thorough spraying with an arsenical poison, making the application at the the leaves begin to appear. Cottony maple scale (Pulvinaria innumerablis (Rathv.). This species was observed in some numbers on the lower limbs of a soft maple at Glen Cove and it has been reported as unusually abundant in St Lawrence county. It is by far the more common insect pest covered with woolly matter, occurruig on maple trees, particularly on Long Island where it is likely to cause more or less injury from year to year. It can be controlled by thorough spray- ing in midsummer with a kerosene emulsion, using about lo to 12% of oil. Winter treatment with the kerosene emulsion diluted with three parts of water, or a whale oil soap solution, I pound to a gallon, has been found very effective by Mr S. Arthur Johnson in Denver, Col. This latter method results in a great saving, as one fourth the amount of the insecticide necessary to spray a tree in foliage is sufficient to cover it after the leaves have fallen. Maple Phenacoccus (.Phenacoccus acericola King ). This, ordinarily a rare insect, has
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
