. Annual report - Entomological Society of Ontario. Entomological Society of Ontario; Insect pests; Insects. 38 THE REPORT OF THE + c log x equals y. It will be seen that the actual data follow the curve fairly 6 8/0/2 I* lb IB 20 22 24 2 6 26 30 32 34. Figure 3.—The relation of temperature to the length of the incubation period. Logarithmic parabolic trend.** The Ejects of Temperature on the Length of the Larval Feeding Period:— In correlating temperature with the length of the feeding period certain other influencing factors have to be considered, —the type and amount of food.
. Annual report - Entomological Society of Ontario. Entomological Society of Ontario; Insect pests; Insects. 38 THE REPORT OF THE + c log x equals y. It will be seen that the actual data follow the curve fairly 6 8/0/2 I* lb IB 20 22 24 2 6 26 30 32 34. Figure 3.—The relation of temperature to the length of the incubation period. Logarithmic parabolic trend.** The Ejects of Temperature on the Length of the Larval Feeding Period:— In correlating temperature with the length of the feeding period certain other influencing factors have to be considered, —the type and amount of food. Rearing experiments have shown that when larvae were fed on year-old (stor- age) apples the length of the feeding period was greatly increased, but that it was approximately the same for larvae fed on either fresh apples or peaches. The length of the period is inclined to be somewhat shorter when the larvae feed in peach shoots. TABLE NO. 15 Average Length Average Type of Food of Feeding No. of Temperature Period Larvae Degrees F. Storage Apples 28 days 367 Peach Shoots 20 days 55 When large numbers of caterpillars are fed in a single fruit the average length of the feeding period will be longer than if a plentiful supply of food had been available. Although other factors cannot be neglected, it is quite evident that tem- perature is the most important regulator of the feeding period. During warm spells in mid-summer larvae have completed their feeding in as short a period as nine days when the average daily temperature for the period was 76 degrees F. In contrast with this, some caterpillars required from 80 to 92 days to complete their feeding period when the average daily temperature was degrees F. The accompanying graph (figure 4) has been compiled by a random selec- tion from a large number of records of larvae reared in green peaches and fresh apples under insectary conditions. The graph shows clearly the increase in the length of the feeding period a
Size: 2183px × 1145px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
