The European Corn Borer, Pyrausta Nubilalis Hubn.: II. A Discussion of Its Seasonal History in Relation ot Various Climates

Ecology ◽  
1927 ◽  
Vol 8 (2) ◽  
pp. 177-193 ◽  
Author(s):  
Kenneth W. Babcock
Keyword(s):  
European Corn Borer ◽  
Corn Borer ◽  
Pyrausta Nubilalis ◽  
Seasonal History

FURTHER OBSERVATIONS ON THE CHANGES TAKING PLACE IN THE CORN BORER POPULATION IN WESTERN ONTARIO

1947 ◽  
Vol 79 (5) ◽  
pp. 81-83 ◽  
Author(s):  
Geo. Wishart
Keyword(s):  
European Corn Borer ◽  
Corn Borer ◽  
Important Relationship ◽  
Two Generations ◽  
History Of ◽  
Consistent Increase ◽  
Pyrausta Nubilalis ◽  
Seasonal History

The seasonal history of an insect has an important relationship to the success or failure of any efforts to usr parasites in its control. In the work on parasites of thr European corn borer, Pyrausta nubilalis Hubn., over a period of years, the writer has had an opportunity to observe the changes which have taken place in the seasonal history of this insect in Western Ontario. It was shown by the writer (Wislwt, 1942, 1944) that there was a gradual and rather consistent increase in the proportion of the population which had two generations instead of one. The present paper presents further data pertinent to this subject.

Scambus pterophori (Ashm.) (Hymenoptera: Ichneumonidae), a New Parasite of the European Corn Borer, Pyrausta nubilalis (Hbn.) (Lepidoptera: Pyralidae), in Canada

1959 ◽  
Vol 91 (2) ◽  
pp. 128-128
Author(s):  
Marcel Hudon
Keyword(s):  
European Corn Borer ◽  
Second Generation ◽  
Petri Dish ◽  
First Record ◽  
Corn Borer ◽  
Lepidoptera Pyralidae ◽  
Pyrausta Nubilalis ◽  
Experimental Plots

In late August, 1957, a parasitized second-generation pupa of Pyrausta nubilalis (Hbn.) was observed in silks of an immature corn ear in the experimental plots at St. Jean. The pupa was incubated at 75°F. in a petri dish, and two weeks later an ichneumonid parasite emerged and was identified by Mr. G. S. Walley, Entomology Division, Ottawa, as Scambus pterophori (Ashm.). Asecond generation of P. nubilalis is very unusual in the St. Jean area. This is apparently the first record of this ichneumonid as a parasite of P. nubilalis in Canada.

On a new Species of Ephialtes (Hym., Ichneumonidae) parasitising the Codling Moth

1942 ◽  
Vol 33 (3) ◽  
pp. 171-174 ◽  
Author(s):  
J. F. Perkins
Keyword(s):  
New Species ◽  
European Corn Borer ◽  
Cydia Pomonella ◽  
British Museum ◽  
Codling Moth ◽  
Species Group ◽  
Type Specimens ◽  
Corn Borer ◽  
Pyrausta Nubilalis ◽  
A New Species

In 1939 I dealt with two species of Ephialtes which parasitise the codling moth, Cydia pomonella, L., namely E. caudatus, Ratz., and E. crassiseta, Thoms., and showed how they differed from E. punctulatus, Ratz. (=extensor, Tasch.) with which species they had formerly been confused. During 1940, F. J. Simmonds, of the Imperial Institute of Entomology, sent to the British Museum a series of a species of Ephialtes bred from this same host in the south of France. This is a new species, and it was previously known to me only from a single female which had been bought by D. S. Wilkinson from O. Schmiedeknecht, who had incorrectly named it Pimpla roborator, F. In fact, this new species does not belong to the same species group as Ephialtes (Exeristes) roborator, F., Grav. (=Pimpla roborator, F., Schmied.), which is a well-known parasite of the European Corn Borer (Pyrausta nubilalis, Hb.) and also parasitises many other hosts.As there has been considerable confusion in the synonymy and interpretation of E. roborator, F., it seems advisable to give notes on the relevant type specimens seen by me. It has been impossible to find the type of Ichneumon roborator, F. Gravenhorst's interpretation of this very variable species has therefore been taken. The description given by Schmiedeknecht in his Opuscula Ichneumonologica is adequate for the recognition of the female ; the male is very distinct, having a tubercle in the middle of the clypeus, a character unknown in any other described European species. Pimpla cicatricosa, Ratz., which is given by Schmiedeknecht as a synonym of P. roborator, F., is a distinct species.

Observations on the Influence of Temperature and Humidity on the Bionomics of Dysdercus cingulatus, Fabr.

1930 ◽  
Vol 21 (4) ◽  
pp. 547-562 ◽  
Author(s):  
Dev Raj Mehta
Keyword(s):  
European Corn Borer ◽  
Effective Control ◽  
Sowing Time ◽  
Corn Borer ◽  
Insect Ecology ◽  
Dysdercus Cingulatus ◽  
Temperature And Humidity ◽  
Two Factors ◽  
Adverse Environmental Conditions ◽  
Pyrausta Nubilalis

It is being recognized that for a satisfactory solution of many of the wider problems of Applied Entomology, a study of insect ecology is of paramount importance. It is expected that a knowledge of the factors which influence distribution and abundance of insects will arm economic entomologists better in their warfare against pests. Just recently, Lathrop (1923), Shelford (1927), Buxton (1929), Uvarov (1929), Gryse (1929), and others have shown the importance of meteorological phenomena affecting the development, distribution, and activities of insects. Although our knowledge of the two factors so far studied—temperature and humidity—is far from being complete, still the results so far obtained have proved to be of considerable value. Indeed, instances of the practical application of such knowledge are already available. From his studies on the effects of temperature on household insects, Howard (1896) has shown that cold storage provides an effective control of these pests. Pierce (1916) has correlated the relative advance and retreat of the fall army-worm, Laphygma frugiperda, S. & A., with changes in temperature. He maintains that a proper fixation of the zone of effective temperatures may make it possible to alter the sowing time of winter crops to avoid damage from this insect. Barber (1925) explains the decrease of the European corn-borer, Pyrausta nubilalis, Hübn., during certain years on the basis of adverse environmental conditions. A. Howard (1921), from his observations in India, states that there exists a definite relationship between termite activity and soil temperature.

Dibrachys cavus (Wlkr.) (Hymenoptera: Pteromalidae), a New Parasite of the European Corn Borer, Pyrausta nubilalis (Hbn.) (Lepidoptera: Pyralidae), in Canada

1956 ◽  
Vol 88 (1) ◽  
pp. 25-25
Author(s):  
Marcel Hudon
Keyword(s):  
North America ◽  
European Corn Borer ◽  
Adult Stage ◽  
Corn Borer ◽  
Lepidoptera Pyralidae ◽  
Pyrausta Nubilalis ◽  
Experimental Plots

During the latter part of June, 1955, a larva of the European corn borer, Pyrausta nubilalis (Hbn.), dissected from overwintered corn stalks in experimental plots at St. Jean was observed to be parasitized by hymenopterous larvae. These were reared to the adult stage and were then identified by Dr. O. Peck, Entomology Division, Ottawa, as of Dibrachys cavus (Wlkr.). This parasite has only once been reported from North America (Blickenstaff et al., 1953, p. 377) and once from Russia (Thompson, 1946, p. 517).

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