. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. HEMIPTERA: THE TRUE BUGS 83 are found so frequently upon the bark of trees. If you examine the twigs or leafy branches of some apple trees, you will probably find what look like miniature oyster shells upon the bark. These are ex- amples of the Oyster-shell Scale. If > you will carefully pry up one of these tiny scales and look at its under side with a lens, you will probably find a large number of minute oval eggs. Early in summer, these eggs hatch into tiny insects th
. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. HEMIPTERA: THE TRUE BUGS 83 are found so frequently upon the bark of trees. If you examine the twigs or leafy branches of some apple trees, you will probably find what look like miniature oyster shells upon the bark. These are ex- amples of the Oyster-shell Scale. If > you will carefully pry up one of these tiny scales and look at its under side with a lens, you will probably find a large number of minute oval eggs. Early in summer, these eggs hatch into tiny insects that wander over the sur- face of the young bark. In a day or two, they fix themselves in one place by inserting their beaks into the tissues and sucking out the sap, where they re- main and gradually develop their scaly covering. One of the most destructive insects ever introduced into America belongs to this family. It is the notorious San Jose Scale, a pest that during recent years has attracted more attention from fruit growers than any other insect. It is especially dangerous because its presence is difficult to detect until it becomes sufficiently abundant to injure or kill the infested tree. It then appears as a curious scaly crust on the bark. When only a few are present, they are difficult to find, as they are simply small circular spots of much the same color as the bark, plainly seen only through a magnifying glass. The appearance of the individual scales is well shown in the pictures on the next page. Each scale is a small circular object, closely attached to the bark, not more. Scale Insects on Rose. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Weed, Clarence Moores, 1864-1947. Boston ; New York : D. C. Heath & Co.
Size: 979px × 2553px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1910
