摘要:

AbstractThe antifungal action of zinc dimethyldithiocarbamate and of zinc ethylenebisdithiocarbamate in the presence of the dithiocarboxylic acid derivatives I and III as well as of some known metal‐complexing agents was tested on Botrytis allii and Alternaria tenuis as test organisms. Addition of some of the investigated compounds to zinc dimethyldithiocarbamate increased its antifungal activity by several orders of magnitude against Botrytis but not against Alternaria. This action is not structure specific as it can be produced by complexing agents of various chemical structure. Under the same conditions the antifungal action of zinc ethylenebisdithiocarbamate could not be increase

ISSN:0031-613X    

DOI:10.1002/ps.2780020601

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractThe synthesis of seven 4‐(1‐cyclopropylalkyl)‐ and eight 4‐(1‐isopropylalkyl)‐2, 6‐dinitrophenols is described. When tested, together with six 4‐(1‐n‐propylalkyl)‐2, 6‐dinitrophenols, several of these compounds showed high protectant activities against apple and cucumber powdery mildews. Their activities are discussed in relation to π values obtained from g.l.c. retention times, and to hydrogen bonding characteristics (both intra‐and inter‐) derived from

ISSN:0031-613X    

DOI:10.1002/ps.2780020602

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractThe response of several plant species (dwarf bean, tomato, pea, cabbage, nettle and buttercup) to treatment with iodide has been investigated. Selective toxicity of iodide has been confirmed, sensitive species exhibiting severe desiccation of the leaves.Iodination of cellular components following treatment of bean leaves with iodide has been demonstrated, indicating that the iodide undergoes intracellular oxidation to iodine. This is thought to be brought about by peroxidase enzymes. Peroxidase activities (in relation to iodide oxidation) in the leaves of the plants studied have been determined. Although very low peroxidase activities are correlated with iodide tolerance, the results obtained indicate that the extent to which iodide accumulates in the leaves is also an important contributory factor in iodide selective toxicity.

ISSN:0031-613X    

DOI:10.1002/ps.2780020603

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY

摘要:

Abstract3‐Furylmethyl and furfuryl chrysanthemates with methyl, benzyl, substituted benzyl and alkenyl substituents, and other heterocyclic analogues of these compounds, are synthesised for structure‐insecticidal activity investigati

ISSN:0031-613X    

DOI:10.1002/ps.2780020604

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractThe carbon disulphide evolution method is suitable for establishing the group specificity of an unknown dithiocarbamate fungicide. At 55°C methyldithiocarbamates release all their as CS2whether hydrolysed in sulphuric acid or acetic acid solution, whereas the liberation of CS2from bisdithiocarbamates in sulphuric acid is at least 2–5 times as high as in acetic ac

ISSN:0031-613X    

DOI:10.1002/ps.2780020605

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY

ISSN:0031-613X    

DOI:10.1002/ps.2780020606

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractThe losses of dieldrin and aldrin by volatilisation from crystalline deposits on glass surfaces in different environments were studied by using these insecticides labelled with the radioactive isotope36CL as a tracer.Volatilisation rates were very sensitive to changes in temperature and to a lesser extent to air movement, but not to change in relative humidity (the effect of which was measurable only on porous glass surfaces).All rates of loss from glass surfaces could be described mathematically in terms of single or double exponential equations, although many were better described by simple sigmoid (logistic) equations.

ISSN:0031-613X    

DOI:10.1002/ps.2780020607

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractHessian fly was controlled to a maximum of 95% with organophosphate insecticides, in terms of the number of puparia and percentage tiller infestation at harvest.Granules: phorate at 1.68 kg/ha (1 1/2 lb/acre) as 10% granules in the seed furrow was most effective on durum wheat in 1967–8, with 69–92%, control, of tillers infested. 1.12 kg/ha gave 74–89% control, 0.56 kg/ha in the seed furrow 35–54%. Seed furrow treatment was more effective than band or broadcast treatment over young plants, although granules broadcast over young barley at 1.68 kg/ha of phorate gave 74% control in 1967–8. Fonofos (Dyfonate) granules at 1.55 kg fonofos/ha were most effective on barley in 1968–9, with 66% control. After fonofos and phorate, disulfoton at 1.68 kg disulfoton/ha was next in effect, with up to 86%, control in 1967‐8 and 24% in 1968–9, but variable and not much more effective than at 0.56 kg/ha. Other insecticides were less effective.Seed dressings: disulfoton was the most effective, giving 79% control in 1967‐8 on wheat and 77% on barley at a high rate of application that was phytotoxic in 1968–9. Diazinon, bromophos and ethion gave 15–38%, control and chlorfenvinphos and dimethoate less. Carbaryl dust at 1.12 kg carbaryl/ha gave 32% control.Yields were poor, but grain yield was increased by up to 33% in wheat in 1967‐8, averaging about 15%. Barley yield was increased by 7% in 1967–8, and from 9–23% in 1968‐9 by fonofos and phorate granules. Insect control reduced the number of tillers, increased the number of heads and increased the grain weight per head.In observation plots, chlormequat (CCC) spray alone at the 5‐leaf stage reduced infestation of wheat by between 22% and 43%, but CCC with fertilizer, and fertilizer alone had no conclusive effect. High fly populations are partly due to leaving crop residues in the field at harvest. When these can be ploughed in, infestation should decrease. The use of insecticides may not be economic unless more consistent inc

ISSN:0031-613X    

DOI:10.1002/ps.2780020608

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractThe present status of anticoagulant‐resistant populations of Rattus norvegicus and Mus musculus in Britain is elaborated and special reference is made to evidence of the practical consequences of resistance for rodent control. A short review is given of genetical and toxicological aspects of resistance and it is predicted that continued dependence upon the anticoagulant rodenticides will lead to the development of new resistance problems. The failure of schemes for the eradication or containment of resistant rat populations by local use of alternative rodenticides is discussed and an approach based more soundly upon the principles of ecological genetics is indicated. It seems in practice, however, that the continued spread of resistance to anticoagulants in Britain is now inevitable and that the development of improved alternative rodenticides will be necessary in order to avoid a decline in the standard of rodent contro

ISSN:0031-613X    

DOI:10.1002/ps.2780020609

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY

ISSN:0031-613X    

DOI:10.1002/ps.2780020610

出版商:John Wiley&Sons, Ltd    

年代:1971

数据来源: WILEY