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Now showing items 21-30 of 36
Leptosphaeria diseases of oilseed rape and swede: identification and epidemiology
(Lincoln University, 2014)
Leptosphaeria maculans and L. biglobosa cause stem canker and dry rot disease on brassica crops. Although the disease has been reported to be present in New Zealand brassica cropping areas a comprehensive assessment of the ...
An investigation of the chemical reactions of esters of phosphoric acid and alkylphosphoric acids in relation to their chemosterilant activity on Tetranychus urticae (Koch)
(Lincoln College, University of Canterbury, 1970)
In recent years considerable attention has been given to the study of biological effects produced by chemical alkylating agents (Ross, 1962; Wheeler, 1962; Alexander, 1960; Auerbach, 1958; Borkovec, 1962). These compounds ...
Pyrenophora tritici-repentis the causal agent of tan spot: characterisation of New Zealand populations
(Lincoln University, 2015)
Tan spot, caused by the ascomycete fungus Pyrenophora tritici-repentis, is one of the most economically significant and devastating foliar diseases of wheat. In this study, the distribution, genetic diversity and race ...
Toxicity studies of insecticides on lucerne aphids and their predators
(University of Canterbury, 1980)
The insecticides pirimicarb, fenvalerate, chlorpyrifos and demeton-S-methyl were tested against lucerne aphids Acyrthosiphon kondoiShinji and A. pisum (Harris) and against the natural enemies Austromicromus tasmaniae ...
Comments on the ecology of grass grub and porina caterpillar
(New Zealand Grassland Association., 1968)
The object of this paper is to discuss the ecology of grass
grub, Costelytra zealandica White, and porina, Wiseana
cervinata (Walker), New Zealand’s most important
pastoral insect pests, and to survey what has been ...
The population dynamics of the cabbage aphid, Brevicoryne brassicae (L.), in Central Otago, New Zealand
(Lincoln College, University of Canterbury, 1975)
The field method developed by McLaren (1968) for making life table studies of the cabbage aphid, Brevicoryne brassicae (L.), was used to record details of survival, causes of mortality, daily reproductive output and total ...
The defoliation of pasture by Aphodius tasmaniae Hope (Coleoptera : Scarabaeidae) larvae studied with remote sensing and controlled environment methods
(Lincoln College, University of Canterbury, 1983)
Aphodius tasmaniae Hope is an intermittent pest of pastures in Canterbury. The defoliating biology of the larvae was investigated using remote sensing and controlled temperature methods in order to understand the mechanisms ...
Evaluation of insecticides against the larval stages of the Argentine stem weevil, Hyperodes bonariensis Kuschel (Coleoptera: Curculionidae) on wheat : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Agricultural Science in the University of Canterbury [Lincoln College]
(Lincoln College, University of Canterbury, 1970)
With the increased recognition of the Argentine stem weevil, Hyperodes bonariensis Kuschel, as an important pest of pastures, cereal and brassica crops, and in the absence of any known biological control agents in New ...
Flight behaviour of the porina moth (Wiseana cervinata)
(Lincoln College, University of Canterbury, 1971)
The importance of agriculture in New Zealand is well documented. Among the worst pests of improved grasslands are species of Wiseana, an indigenous genus which attacks pasture over a wide area of New Zealand. These insects ...
The development of life tables for studying the population dynamics of the cabbage aphid, Brevicoryne brassicae (L.) : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Horticultural Science with Honours in the University of Canterbury [Lincoln College]
(Lincoln College, University of Canterbury, 1968)
A method was described whereby information was obtained from field populations of the cabbage aphid, Brevicoryne brassicae and the results were used for the development of life tables.
Statistical analyses of the life ...