Skip to main content


  • M. K. Mukerji (a1), S. H. Gage (a1) and R. L. Randell (a2)

The study examined quantitatively the effects of embryonic development in the preceding fall and cumulative heat units from 1 April to 31 July in the current year on density trends of three major grasshopper species (Melanoplus sanguinipes (Fabr.), M. bivittatus (Say), and Camnula pellucida (Scudder)) in Saskatchewan. The influence of adult density of the previous year, embryonic development, heat units, and their interactions were examined by multiple regression analyses for each of the three species to determine their contribution to next year’s adult populations. The models tended to underestimate density during a population increase and to overestimate during a population decline. Combined heat units during the preceding fall and following spring indicated that a general increase in density should occur when heat units were equal to or greater than 1600 °D50.

Hide All
Baskerville, G. L. and Emin, P.. 1969. Rapid estimation of heat accumulation from maximum and minimum temperatures. Ecology 50: 514517.
Criddle, N. 1917. Popular and practical entomology. Precipitation in relation to insect prevalence and distribution. Can. Ent. 49: 7780.
Edwards, R. L. 1960. Relationship between grasshopper abundance and weather conditions in Saskatchewan, 1930–1958. Can. Ent. 92: 619624.
Edwards, R. L. 1964. Some ecological factors affecting the grasshopper populations of Western Canada. Can. Ent. 96: 307320.
Gage, S. H., Mukerji, M. K., and Randell, R. L.. 1976. A predictive model for seasonal occurrence of three grasshopper species in Saskatchewan (Orthoptera: Acrididae). Can. Ent. 108: 245253.
MacCarthy, H. R. 1956. A ten-year study of the climatology of Melanoplus mexicanus mexicanus (Sauss.) (Orthoptera: Acrididae) in Saskatchewan. Can. J. agric. Sci. 36: 445462.
Parker, J. R. 1933. Factors largely responsible for years of grasshopper abundance. Proc. World's Grain Exhibition and Conf., Canada 2: 472473.
Pickford, R. 1960. Survival, fecundity and population growth of Melanoplus bilituratus (Wlk.) (Orthoptera: Acrididae) in relation to date of hatching. Can. Ent. 92: 110.
Pickford, R. 1966. Development, survival and reproduction of Camnula pellucida (Scudder) (Orthoptera: Acrididae) in relation to climatic conditions. Can. Ent. 98: 158169.
Pickford, R. 1972. The effects of climatic factors on egg survival and fecundity in grasshoppers. In Hemming, C. F. and Taylor, T. H. C. (Eds.). Proc. int. Study Conf. Current and future problems of Acridology, pp. 257260.
Pickford, R. and Riegert, P. W.. 1964. The fungous disease caused by Entomophthora grylli Fres., and its effects on grasshopper populations in Saskatchewan in 1963. Can. Ent. 96: 11581166.
Randell, R. L. and Mukerji, M. K.. 1974. A technique for estimating hatching of natural egg populations of Melanoplus sanguinipes (Orthoptera: Acrididae). Can. Ent. 106: 801812.
Riegert, P. W. 1968. A history of grasshopper abundance surveys and forecasts of outbreaks in Saskatchewan. Mem. ent. Soc. Can. 52.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

The Canadian Entomologist
  • ISSN: 0008-347X
  • EISSN: 1918-3240
  • URL: /core/journals/canadian-entomologist
Please enter your name
Please enter a valid email address
Who would you like to send this to? *


Full text views

Total number of HTML views: 0
Total number of PDF views: 2 *
Loading metrics...

Abstract views

Total abstract views: 71 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 14th August 2018. This data will be updated every 24 hours.