. Injurious insects : how to recognize and control them . Insect pests; Insect pests. Fig. 346. Fig. — Emergence of Adult Cicada from pupal skm. OrigmaL as to make the work in the twigs really serious. The ; takes the form of a row of regular ptmctures in the twig, each puncture with a frayed or torn margin. Definite " broods '" of this insect e.\ist in various pans of the country, and these have been studied and mapped so that the coming of the adults can be pre- dicted. The immature stages of the cicada are passed in the soil, and either 13 or 17 years are re- quir
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. Fig. 346. Fig. — Emergence of Adult Cicada from pupal skm. OrigmaL as to make the work in the twigs really serious. The ; takes the form of a row of regular ptmctures in the twig, each puncture with a frayed or torn margin. Definite " broods '" of this insect e.\ist in various pans of the country, and these have been studied and mapped so that the coming of the adults can be pre- dicted. The immature stages of the cicada are passed in the soil, and either 13 or 17 years are re- quired for this part of the insect's growth, depending on the section and the brood. At the end of this time the adults suddenly appear in large mmibers. lay eggs, and another Ufe cycle begins, as before. Bordeaux mixture appears to act as a repellent when sprayed on young trees that are threatened vdxh injur\-. The San Jose Scale (A-^pidiotu-s perniciosus Comst.) This serious pest of fruit trees, shade trees, and ornamentals is an insirhous insect, and seldom is recognized until it has gained a foothold and has already caused marked injiu'y. The first e\'idence of its pres- ence usualh" noted is the weakening or d^ing of twigs. On further -The Periodical Cicada. 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 O'Kane, Walter Collins, b. 1877. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
