The Life History and Habits of the Pear Thrips in California

abdomen adult thrips Antennæ April Average mean temperature Bartlett pear ber of tage bladder blossoming cages caused cherries cluster Contra Costa County Costa County crop of fruit damage deciduous fruits depth early egg stage emergence of pear emergence records February 18 feeding French prunes fruit buds fruit stems full bloom ground inches insect laboratory large numbers larva larvæ leaf stems length loss maximum numbers Mean maximum Mean minimum temperature mesothorax month of February month of March Moulton mouthparts number of eggs Number of thrips observed oviposition ovipositor peaches pear orchard pear thrips Percen placed plant tissue posterior pounds prothorax prune orchards pupa pupæ pupation San Jose Santa Clara County Santa Clara Valley season of 1910 showing emergence Solano Counties species spines Suisun surface Table tage ber tapering temperature for month Terebrantia thrips emerging Thysanoptera tibiæ trees usually varieties Walnut Creek width young fruit