. Bulletin. Natural history; Natural history. Study of the Ciiini ii Bug 533 Z-OB Chinch Bu& IP2Z. Fig. 27. Map of Illinois showing reported areas of damage to crops by chinch bugs in 1922, together with inches of rainfall in Jlay (lower figures) and in June (upper figures) in each locality. Figs. 26-30 show the distribution of infested areas from 1D21 to 1925. The erratic shifting of the areas of abundance from year to year is characteristic and has to lie explained on the basis of favorable weather and either the perennial ])resence of the lings or their flight from infested a
. Bulletin. Natural history; Natural history. Study of the Ciiini ii Bug 533 Z-OB Chinch Bu& IP2Z. Fig. 27. Map of Illinois showing reported areas of damage to crops by chinch bugs in 1922, together with inches of rainfall in Jlay (lower figures) and in June (upper figures) in each locality. Figs. 26-30 show the distribution of infested areas from 1D21 to 1925. The erratic shifting of the areas of abundance from year to year is characteristic and has to lie explained on the basis of favorable weather and either the perennial ])resence of the lings or their flight from infested areas. In the southern half of llu; state the former is the more likely explanation, ll'rallicr l\rlali(>iis The fluctuations in ;ibinulanre of chinch bugs ha\e long been associated with weather conditions. The early writers refer to late spring rains as causing the destruction of the bugs. It was i^ointed out. 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
