Proceedings of the New Zealand Weed and Pest Control Conference1969 - Pesticides |
From inside the book
Results 1-3 of 73
Page 273
... populations rise too high , so insecticide usage should aim at a balance which reduces damage to a practical level without up- setting desirable soil structure and fertility . It is definite from earlier Canterbury work ( Kelsey and ...
... populations rise too high , so insecticide usage should aim at a balance which reduces damage to a practical level without up- setting desirable soil structure and fertility . It is definite from earlier Canterbury work ( Kelsey and ...
Page 324
... populations assessed in the February - March period conform approximately to levels capable of causing enough damage to warrant possible later control ( say , by chemicals ) . There are obvious difficulties in trying to obtain ...
... populations assessed in the February - March period conform approximately to levels capable of causing enough damage to warrant possible later control ( say , by chemicals ) . There are obvious difficulties in trying to obtain ...
Page 181
... populations of grass grub , infested areas are clearly defined by damage in late March . Over 90 % of a population is confined to the visibly infected area or within a surrounding two foot margin . Populations usually increase from ...
... populations of grass grub , infested areas are clearly defined by damage in late March . Over 90 % of a population is confined to the visibly infected area or within a surrounding two foot margin . Populations usually increase from ...
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 | |
35 other sections not shown
Other editions - View all
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