N. D. Holmes

Publications33
h-index14
Citations624
Highly Influential Citations56
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Causes of Variations in Effectiveness of Bracon cephi (Gahan) (Hymenoptera: Braconidae) as a Parasite of the Wheat Stem Sawfly
TLDR
It appears that moderate to high levels of parasitism required that the crop ripen late in at least one year out of two, whereas a moderately high level occurred even though the weather of the current year was conducive to early ripening, provided that the wheat in the preceding year had ripened late.
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POPULATION DYNAMICS OF THE WHEAT STEM SAWFLY, CEPHUS CINCTUS (HYMENOPTERA: CEPHIDAE), IN WHEAT
The effects of the major factors on populations of the wheat stem sawfly, Cephus cinctus Norton, were studied in the field at Lethbridge, Alberta between 1970 and 1977. Fecundity of the females,…
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The effect of the wheat stem sawfly, Cephus cinctus (Hymenoptera: Cephidae), on the yield and quality of wheat.
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THE INFLUENCE OF THE HOST ON OVIPOSITION BY THE WHEAT STEM SAWFLY, CEPHUS CINCTUS NORT. (HYMENOPTERA: CEPHIDAE)
Differences in host development largely determined the relative times, amounts, and locations of oviposition by the wheat stem sawfly in various hosts studied under field conditions. The difference…
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THE EFFECT OF LIGHT ON THE RESISTANCE OF HARD RED SPRING WHEATS TO THE WHEAT STEM SAWFLY, CEPHUS CINCTUS (HYMENOPTERA: CEPHIDAE)
TLDR
Experimental evidence showed that a sufficient reduction in the amount of light (particularly during mid-June) significantly reduced sawfly resistance, which was significantly related to variations in the number of days with measurable precipitation.
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EFFECTS OF MOISTURE, GRAVITY, AND LIGHT ON THE BEHAVIOR OF LARVAE OF THE WHEAT STEM SAWFLY, CEPHUS CINCTUS (HYMENOPTERA: CEPHIDAE)
Until mid- or late July, most larvae of the wheat stem sawfly generally move into the upper internodes of the host stems. Then, as the stems mature, the larvae migrate down to the basal internodes…
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The pupation behaviour of the western flower thrips, Frankliniella occidentalis (Pergande)
TLDR
Glasshouse experiments with water traps, sticky traps and infra-red video recording in crops of cucumber and pot chrysanthemum, when average relative humidities were below 80%, showed that large numbers of second-instar larvae dropped to the ground to pupate.
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Effect of grazing by cattle on the abundance of grasshoppers on fescue grassland.
TLDR
If different intensities of grazing affect the densities of various species of grasshoppers on native fescue rangeland is determined to determine if changes in the vegetative cover should result in changes in grasshopper populations.
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Swathing wheat and survival of wheat stem sawfly
TLDR
To prevent losses from sawfly cutting without reducing yield by swathing too early, swathing should not be started before the sawflies begin cutting.
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Heptachlor as a Systemic Insecticide against the Wheat Stem Sawfly, Cephus cinctus Nort.
TLDR
To be effective, heptachlor evidently required light sawfly infestations restricted mainly to the lower internodes of the stems such as had occurred in 1960, and in that year it gave its best control although it was no more effective than a moderately sawfly-resistant wheat.
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