Proceedings of the New Zealand Weed and Pest Control Conference1969 - Pesticides |
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Page 214
... season to season , and from one variety to another . There is evidence that not all winged cereal aphids were carrying BYDV . INTRODUCTION BARLEY YELLOW DWARF VIRUS ( BYDV ) was first recorded in New Zealand in 1953 ( Smith , 1955 ...
... season to season , and from one variety to another . There is evidence that not all winged cereal aphids were carrying BYDV . INTRODUCTION BARLEY YELLOW DWARF VIRUS ( BYDV ) was first recorded in New Zealand in 1953 ( Smith , 1955 ...
Page 215
... seasons , there was one trial to assess the value of demeton - S - methyl ( DSM ) sprays during the winter for the control of aphids and BYDV . In each season , there were increased yields following treatment : 1959-60 20 % increase ...
... seasons , there was one trial to assess the value of demeton - S - methyl ( DSM ) sprays during the winter for the control of aphids and BYDV . In each season , there were increased yields following treatment : 1959-60 20 % increase ...
Page 181
... season to season by spreading peri- pherally from the areas initially inhabited . Only very low numbers , and very small areas of damage have been observed which cannot be attri- buted to increases in grass grub aggregates which were ...
... season to season by spreading peri- pherally from the areas initially inhabited . Only very low numbers , and very small areas of damage have been observed which cannot be attri- buted to increases in grass grub aggregates which were ...
Contents
Presidential Address W F Leonard | 15 |
Control of Hornwort Ceratophyllum demersum B E Manson | 23 |
Endothal as an Aquatic Herbicide G W Woon and G W Mason | 30 |
Copyright | |
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Common terms and phrases
abAB acre aphid application areas assessment asulam atrazine Auckland Australian soldier fly autumn barley grass bromus mollis BYDV Canterbury carbetamide cereal aphid chemical chlormequat Christchurch crop damage Department of Agriculture diazinon dicamba diquat disulfoton dry matter effect ester farm farmers fathen fenitrothion fensulfothion formulations gorse grain gran granules grass grub grazing growth harvest heptachlor herbicides increase infestation insecticide ioxynil larvae lb/acre lindane linuron lucerne matagouri MCPA MCPB means and signif methabenzthiazuron mixture N.Z. Weed organophosphate P.O. Box paddock paraquat parathion pasture response peas Pest Control Conf phenmedipham phorate picloram plants plots porina post-emergence Proc production prometryne pyrazon rainfall rates reduced replicates residual ryegrass samples season significant simazine soil sowing sown species spraying Stat Summary Table terbutryne thistle tion Total treated Treatment lb trials trichlorfon Untreated variety Weed & Pest weed control weed seeds wheat white clover willow weed yield Zealand