. Injurious insects of the orchard, vineyard, field, garden, conservatory, household, storehouse, domestic animals, etc., with remedies for their extermination . ng spray withNos. 4, 5, or 7. CHAPTER LX. The Pear-tree Psylla. (Cal.) (Psylla pyri.—Linn«us.) Order, Hemiptera ; i ,-, ., . r, 1 1 XT I h amilv, Sub-order, Homoptera ; ) - [Living in communities upon and puncturing the twigs ofthe pear tree; a small, yellowish or greenish louse.] These insects possess the power of leaping, and hence insome localities are known by the name of flea-lice. They 118 INSECTS INFESTING THE PEAR T
. Injurious insects of the orchard, vineyard, field, garden, conservatory, household, storehouse, domestic animals, etc., with remedies for their extermination . ng spray withNos. 4, 5, or 7. CHAPTER LX. The Pear-tree Psylla. (Cal.) (Psylla pyri.—Linn«us.) Order, Hemiptera ; i ,-, ., . r, 1 1 XT I h amilv, Sub-order, Homoptera ; ) - [Living in communities upon and puncturing the twigs ofthe pear tree; a small, yellowish or greenish louse.] These insects possess the power of leaping, and hence insome localities are known by the name of flea-lice. They 118 INSECTS INFESTING THE PEAR TREE. obtain their nourishment by puncturing the twigs with theirbeaks and imbibing the sap. The larvae, or young, are of a dull-orange color, and are obtuse behind. (Pupa, Fig. 90). The per-fect or winged insects (Fig. 91) are a little over a line long tothe tip of the closed wings ; the eyes are large and prominent;the head and thorax are of a brownish-orange color, and theabdomen is greenish; the wings are transparent. I havefound this species in one orchard only, and not sufficientlynumerous to do much damage to the trees infested. Fig. 90. Fig. Fig. 90.—Pupa of Pear-tree Psylla, highly magnified—col-ors, orange-red and black ; a, ventral view ; 6, back view. Fig. 91.—Pear-tree Psylla, enlarged—colors, orange-red andblack. Remedies.—Trees infested the previous year should, whendormant, be thoroughly sprayed wth No. 13—five pounds ofmixture to six gallons of water. In April, spray with Nos. 5or 7. Repeat the spraying in two weeks, if necessary. CHAPTER LXI. The Pear Slug. {Selandria cerasi—Peck.) Order, Hymenoptera ; Family, [A small twenty-footed caterpillar, covered with a stickyolive-colored slime, infesting the foliage of the pear and cherrytrees.] The specific name, cerasi, given to this saw-fly, places this INSECTS INFESTING THE PEAR TREE. 119 insect as a pest of the cherry tree, but in this state it does mostinjury to the pear; the
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