Dieldrin Sprays as a Control for Frit Fly in Spring Oats

Fidler, Justyna

doi:10.1111/j.1365-3059.1958.tb00841.x

Cited by 7 publications

(10 citation statements)

References 3 publications

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“…The results confirm previous observations in South Wales (Fidler, 1958). A dieldrin spray apphed at peak adult first generation emergence, gives some control of tiller attack, and reduces the panicle infestation.…”

Section: Further Observations On Frit Fly Control In South Walessupporting

confidence: 90%

“…by D. WEBLEY National Agricultural Advisory Service, Cardiff WORK on the use of dieldrin for the control of frit fly in spring oats in South Wales has been summarized by Fidler (1958). It was suggested, from the evidence of field trials, that the insecticide applied for controlling first generation attack also gave some control of the later panicle attack.…”

Section: Further Observations On Frit Fly Control In South Walesmentioning

confidence: 99%

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Further Observations on Frit Fly Control in South Wales

Webley¹

1960

Plant Pathology

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Section: Further Observations On Frit Fly Control In South Walessupporting

confidence: 90%

Section: Further Observations On Frit Fly Control In South Walesmentioning

confidence: 99%

Further Observations on Frit Fly Control in South Wales

Webley¹

1960

Plant Pathology

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“…Some damaged shoots are likely to have wilted and disappeared but, even allowing for this and errors due to sampling, this difference seemed so large and the improvement in the appearance of the sprayed plots so striking that a possibility of recovery of shoots showing symptoms of attack had to be considered. Fidler (1958) also noticed a decrease in number of damaged shoots in some of his experiments, following spraying with dieldrin and concluded that the damaged shoots must have recovered.…”

Section: Recovery Of Damaged Shoots After Sprayingmentioning

confidence: 92%

Experiments on the control of frit fly,Oscinella frit(L.), on late-sown oats with seed dressings and ‘late’ sprays

Legowski

Gould

1961

Bull. Entomol. Res.

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Since 1952, investigations have been done at Cambridge on the control of the spring generation of frit fly, Oscinella frit (L.), on oats. In that year, in a replicated plot trial referred to by Thomas (1958), oats drilled on 22nd April were sprayed with 0-05 or 0-1 per cent, y BHC on 19th May, when the plants were in the two-shoot stage and when approximately 30 per cent, of shoots were already showing symptoms of frit damage. By 29th May, there were 23 and 19 per cent, damaged shoots on the treated and 44 per cent-on the untreated plots, respectively. By mid-June, the difference in the appearance of the plots became quite striking (PL V, fig. 1), and by harvest time the treated plots appeared normal while the controls were nearly a failure.This early trial demonstrated that it might be possible to prevent further frit damage and to save the crop by spraying when plants were already attacked; and although in the following years we investigated other aspects of chemical control, in particular seed dressings, since 1956 our attention has been mainly focused on the therapeutic value of what we call ' late ' sprays, i.e., sprays applied when symptoms of attack are already apparent, as opposed to the prophylactic sprays of DDT applied just before or at the time of egg-laying. The early preventive sprays of DDT give a reasonably good control of the first-generation attack (Thomas, 1958). However, in common with other preventive methods of control, they must be applied as an insurance and their big drawback is the difficulty of predicting with certainty when and where the outbreaks will occur. The late sprays on the other hand, if effective, could be applied only when necessary, a distinct advantage with a pest of fluctuating incidence. Experimental methods. Variety, location and plot layout.With the exception of the National Agricultural Advisory Service co-operative trials, which are referred to separately in the text, the trials were done on a fouracre plot of land (sandy loam) near Cambridge, growing a mixture of cereals, vegetables and fruit, surrounded by wide strips of grass and adjoining agricultural land. The oats, variety Star in 1954 and Sun II in other years, were sown by hand drill in rows spaced at 7-8 in. at approximately 3 bushels per acre, usually in April, which is late for this area, but this increased the likelihood of a frit-fly attack. The size of plots varied from 81 sq. ft. in 1956 to 375 sq. ft. in 1959; they were separated by 2-ft.-wide paths or guard strips. The plot layout was a randomised block with three replicates in 1956 and four or five replicates in other years. Assessment of the results.This was based on counts of healthy and attacked shoots in 10 sample lengths of row per plot. The sample unit was two adjacent 1-ft. lengths of row, and counts were made along the diagonal on each plot. In the seed-dressing experiments the counts were made once or twice 3-5 weeks after the beginning of egg-laying,

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“…A rather different trial was therefore laid down. This was partly designed to investigate methods of chemical control which have been reported elsewhere (Fidler, 1958; Thomas, 1958) to give information not available in the previous date-of-sowing trials. Thus two adjoining trials were laid down at Usk, one of S. 84 and the other of S. 221 both with plots sown at two different dates, 10 and 30 April.…”

Section: Methods Of Investigationmentioning

confidence: 99%

“…Such values are not reached until at least after the &leaf stage so that no great warning of final damage can be obtained. However, such results might well be useful when advising the use of a late dieldrin spray (Fidler, 1958), for it could be determined, at least roughly, how much more damage might be expected and whether the prevention of this was economically justified.…”

Section: Sowingmentioning

confidence: 99%