. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE PEAR THRIPS. the plant epidermis with the stylets, then, movinji; the cone tip back- ward and forward, it enlarges the opening and lacerates the plant tissue by means of the barbed snout. It then pushes the tip of the mouth cone into the puncture thus made and sucks in the plant juices. LarviF feed in a similar way, having similarly constructed mouth-parts. RELATION OF THE BUDDING AND BLOSSOMING OF TREES TO THE FEED- ING HABITS OF THRIPS. The dark-brown adult thrips arrive on the trees in late February and ea
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE PEAR THRIPS. the plant epidermis with the stylets, then, movinji; the cone tip back- ward and forward, it enlarges the opening and lacerates the plant tissue by means of the barbed snout. It then pushes the tip of the mouth cone into the puncture thus made and sucks in the plant juices. LarviF feed in a similar way, having similarly constructed mouth-parts. RELATION OF THE BUDDING AND BLOSSOMING OF TREES TO THE FEED- ING HABITS OF THRIPS. The dark-brown adult thrips arrive on the trees in late February and early March, the period of early opening buds and first blossoms; they are common in March and April, the two months of bloom and early leaf, and all are gone from the trees by the middle of May. Only a few adults can be found after the 1st of May, and most larvae have reached full growth by tliis time and have gone into the ground. Thus it is that the active feeding stages of the thrips coincide with the budding, blooming, and early leaf periods of the host trees. The difference in bud formation and pro- gress of development of various deciduous trees influence to a large extent the man- ner of injury which thrips inflict. Trees may be divided for the sake of convenience, in re- gard to the bud structure, into two groups, namely: (1) Those in which a single fruit bud produces one blossom, such as the almond, apricot, and peach; and (2) those in which a single fruit bud opens out to form a cluster of blossoms which later produces a cluster of fruits, as the prune, cherry, pear, and apple. The relative blooming periods of the several varieties of fruit on which thrips inflict injury, as found \u the Santa Clara A'allc}^, may be noted as follows: Group 1: Almonds, late in Fcliniary; ai>iicots and jicachcs, early in Manli. Gronj) 2: Prunes, middle and last of March; clierries and pears, early in April. These periods vary from year to year and the varieties of each fruit also vary
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