Developmental requirements were determined for both larva and pupa as 503 and 176 degree-days (dd) above a lower threshold of 5°C. Adult emergence occurred from 300 to 700 dd accumulated from January 1st. Cumulative male emergence preceded female's by 50 - 80 dd. A PETE phenology model modified to include...
Freezing to death in winter is a danger faced by ectothermic organisms throughout temperate climates. One adaptation of lepidopteran insects for overwinter survival is the sequestration of antifreeze solutes in the hemolymph prior to pupal diapause. This acts to depress freezing points during the long and immobile pupal stage during...
Attempts were made to rear Crambus topiarius Zeller,
Euchromius ocellus (Haworth), Crambus bonifatellus (Hulst) and
Crambus trisectus (Walker) on non-aseptic meridic diets containing
wheat germ or pinto beans as basic constituents. Various methods
of diet presentation and types of rearing containers were used. Shell
vials and plastic cups used as...
The polyunsaturated fatty acids (PUFA) are known to be required
for larval growth and normal wing development in several
species of Lepidoptera but most of the basic information necessary
for a complete understanding of this nutritional phenomenon has not
been gathered. This includes the role of each of the essential...
The dynamics of a field population of the cinnabar moth, Tyria
jacobaeae L., were studied near Jordan, Linn County, Oregon. In
both 1970 and 1971 larval populations were so large that all foliage of
the host weed, tansy ragwort, Senecio jacobaea L., was consumed.
The ensuing starvation accounted for the...
Ovipositional behavior of the codling moth, Laspeyresia pomonella (L.), on several varieties of apples and pears grown in the Pacific Northwest was investigated during the spring/summer of 1979. Field studies showed that early in the season more eggs were laid on the Bosc variety than on several other apple and...