Advisory Committee on Pesticides Annual Report 2001

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Section F: Other items considered during the year The questionnaire showed that 72 percent of all holdings contacted stored grain and 51 percent used pesticides either as fabric treatments or admixture treatments. Those holdings in the South Western and Midlands and Western regions were more likely to be applying fabric treatments, while the application of both fabric and admixture treatments was more prevalent in the South Eastern region. Almost 16 tonnes of pesticides were applied in farm grain stores in Great Britain with Eastern region accounting for 29 percent of the total weight applied, South Eastern 25 percent, Midlands and Western 19 percent and South Western 14 percent. By weight 54 percent of pesticides were applied as fabric treatments, with pirimiphos-methyl accounting for 88 percent of all fabric treatments. The remaining 46 percent of pesticides were applied to the grain either at or during storage. Of all grain treated, 57 percent by weight was treated with an admixture, the rest receiving surface treatments. Pirimiphos-methyl accounted for 78 percent of the weight of pesticide applied, either as admixture treatments or incorporated into the surface of the grain in store. Contractors applied 14 percent, by weight applied, of fabric treatments but only seven percent of the admixture treatments. Contractors made all applications of aluminium phosphide recorded in this survey. 73 Since the survey conducted in 1994/95 there had been a two percent increase in the tonnage of grain stored, with the weight of active substances applied having increased by less than one percent. There has been a decrease in the number of active substances applied to grain. Organophosphates continued to account for the majority of pesticides used in grain stores and in the current survey they accounted for 97 percent of the total weight of pesticides applied. Report 180: Commercial grain stores in Great Britain 1998/1999 This report presented data from 210 replies from a preliminary questionnaire sent to 283 potential commercial grain stores and the results from visits to 143 premises storing grain from the 1998 harvest in Great Britain and using pesticides. Data had been extrapolated to give national estimates of usage in Great Britain. A total of 8.3 million tonnes of grain was stored of which 52 percent was in upright stores. The questionnaire showed that 94 percent of all premises contacted stored grain and 88 percent used pesticides either as fabric treatments or grain treatments. Stores in Scotland and South Eastern region
<strong>Advisory</strong> <strong>Committee</strong> on Pesticides Annual Report 2001 were more likely to apply fabric treatments, while the application of both fabric and grain treatments was more prevalent in the South Western region. A single commercial store in Wales was encountered in the sample which applied both fabric and grain treatments. Approximately 4.7 tonnes of pesticides were applied in commercial grain stores in Great Britain with Scotland, accounting for 38 percent of the weight, Eastern region 24 percent, Northern region 23 percent, Midlands and Western region 11 percent, South Western region three percent, South Eastern region one percent and Wales less than one percent. By weight, 80 percent of pesticides was applied to the grain either at or during storage. Pirimiphos-methyl accounted for 61 percent of the weight of pesticide applied, either as admixture treatments or incorporated into the surface or the grain in store. Of all grain treated, 92 percent by weight was treated with an admixture, the rest receiving surface treatments. 74 The remaining 20 percent of pesticides were applied as fabric treatments, with pirimiphos-methyl accounting for 53 percent of all fabric treatments and methyl bromide a further 37 percent. Contractors applied 50 percent, by weight applied, of fabric treatments but only eight percent of the admixture treatments. The use of methyl bromide, which can be applied only by contractors, accounted for the bulk of contractor applications made to the fabric. In terms of the number of stores treated, rodenticides were used on 96 percent of commercial grain stores in Great Britain in 1998. Difenacoum was the most commonly occurring rodenticide, being used at 35 percent of all commercial grain stores, followed by bromadiolone at 25 percent. Excluding holdings where the product used was unknown, these two active substances accounted for 68 percent of all recorded occurrences. Totals of just under one kilogram of active substance and approximately ten tonnes of bait were recorded in the current survey, reflecting the extremely low percentage of active substance contained within rodenticide baits. Since the survey conducted in 1994/95, the tonnage of grain stored had more than doubled, with some of the increase being due to the storage of intervention grain, which was minimal in the previous survey period. The weight of active substances applied had increased by 40 percent, which is significantly less than the increase in the grain stored since 1994/95. There had been a continued decrease in the number of active substances applied
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Advisory Committee on Pesticides Annual Report 2001

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