Some aspects of the wheat bulb fly problem <i>The fifth Barnes Memorial Lecture</i>

Raw, F.

doi:10.1111/j.1744-7348.1967.tb04426.x

Cited by 21 publications

(10 citation statements)

References 25 publications

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“…To control populations of wheat bulb fly other approaches should be considered. As Raw (1967) pointed out, a closer examination of the effect of changes in the acreages available for oviposition and the amount of infestation revealed by autumn egg counts, together with a study of the ratio of successful to wasted oviposition, are desirable.…”

Section: Resultsmentioning

confidence: 99%

The Use of Insecticidal Seed Dressings as a Means of Decreasing a Population of Wheat Bulh Fly (Leptohylemyia coarctata(Fall.))

Dixon¹,

Rogerson²

1972

Plant Pathology

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SUMMARY An attempt was made in 1968 to reduce a wheat bulb fly population in a field in northern England by means of insecticidal seed dressings on early and late‐sown winter wheat. Ethion seed dressing reduced plant and shoot attack and also decreased the number of larvae within the plants on the late‐sown plots but not on the early‐sown. Chlorfenvin‐ phos seed dressing had no significant effect on either sowing. It is concluded that the control of wheat bulb fly populations by the use of these seed dressings on wheat crops in the previous year is not a promising means of control.

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Section: Resultsmentioning

confidence: 99%

The Use of Insecticidal Seed Dressings as a Means of Decreasing a Population of Wheat Bulh Fly (Leptohylemyia coarctata(Fall.))

Dixon¹,

Rogerson²

1972

Plant Pathology

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“…1955 1960 1965 1970 1975 1980 1985 1990 Year Fig 3 The mean a n n u d wheat bulb flt egg preparations of held sampling done during the period apparent changes in some of the weather data found to be significant in the regression analyses. Instead, there may be a tendency to dispersal and oviposition in a less limited area of sub-optimum conditions, thus diluting the overall density of oviposition rather than the concentration effect described by Raw (1967). Raw (1967) found that the annual mean egg population was negatively correlated with the area of fallow, a decrease in fallow area thus concentrating oviposition in the remaining area of fallow.…”

Section: Correlationmentioning

confidence: 98%

Changes in wheat bulb fly (Delia coarctata) populations in East Anglia in relation to crop rotations, climatic data and damage forecasting

Young¹,

Cochrane²

1993

Annals of Applied Biology

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Records of wheat bulb fly egg (Delia coarctata) population densities in fields sampled throughout East Anglia in the autumns of are presented. In descending order of risk, fallow, potato, pea (mainly vining), sugar beet and oilseed rape are the main crops preceding wheat or barley which attract oviposition. A declining trend of egg populations observed over the study period may be associated with climatic changes as well as with the elimination of fallow in the rotation and the dramatic increase in the use of insecticides against the pest. Negative correlations ( P < 0.05) in mean annual egg numbers were found with departures from average of July temperature and January air or soil temperature; positive correlations ( P < 0.05) with departure from average of August raindays. Stepwise regression analysis was used to identify the most important relationships of meteorological variables with mean annual egg numbers, or the proportion of fields sampled with egg numbers in excess of the action threshold of 2.5 million eggs/ha. Up to 59% of the variation in the annual proportion of fields above threshold was accounted for in a regression equation using departures from average of July temperature, August raindays and the percentage of average of October (preceding year) rainfall. Estimated mean annual egg populations and the proportion of fields above threshold showed a good fit with the observed values. The findings are discussed and compared with previous work. The forecasting model may be readily incorporated as a regional risk-prediction component of a knowledge-based system for the management of wheat bulb fly control. Regional forecasts of wheat bulb fly oviposition from this work should be tested and modified as necessary according to experience or changing climatic or agricultural factors.

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“…The wheat-bulb fly female lays an average of forty eggs (Raw, 1967;Bardner, Fletcher, Jones & Lofty, 1973). Sixty-five flies/m2 emerged from Stackyard I, the sexratio was unity so 1300 eggs/m2 was the expected natality in Stackyard I1 (the fallow half of that field); the number actually laid, 413, was a reduction of 68 yo.…”

Section: Natalitymentioning

confidence: 98%

“…The mean mortality of the larva I age-interval was 54%, equivalent to 230 larvae. It is well established that this mortality is affected by the number of shoots available to newlyhatched larvae (Raw, 1954(Raw, , 1967. Mean mortality in the larva I1 interval was 68%, equivalent to 139 out of 199 individuals.…”

Section: Mortalitymentioning

confidence: 99%

Fluctuations and regulation of wheat‐bulb fly populations at Rothamsted

Ryan¹

1975

Annals of Applied Biology

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Four populations of the wheat-bulb fly studied at Rothamsted incurred substantial and regulatory losses of larvae caused by food shortage. The following hypothesis is proposed to explain population changes of the fly. Fluctuations caused by weather are stabilized by density-dependent larval mortality caused by food shortage. The effect of weather is, however, pervasive as it also affects food shortage by influencing the number of shoots available to larvae.

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Some aspects of the wheat bulb fly problem The fifth Barnes Memorial Lecture

Cited by 21 publications

References 25 publications

The Use of Insecticidal Seed Dressings as a Means of Decreasing a Population of Wheat Bulh Fly (Leptohylemyia coarctata(Fall.))

The Use of Insecticidal Seed Dressings as a Means of Decreasing a Population of Wheat Bulh Fly (Leptohylemyia coarctata(Fall.))

Changes in wheat bulb fly (Delia coarctata) populations in East Anglia in relation to crop rotations, climatic data and damage forecasting

Fluctuations and regulation of wheat‐bulb fly populations at Rothamsted

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