Potato Stores in Great Britain - The Food and Environment Research ...

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RESULTS AND DISCUSSION WARE POTATOES Storage type The three main types of stores on farm were ventilated (54%), refrigerated (34%) and unventilated (12%). A small quantity, (
substances (a.s.) were used on stored ware potatoes, comprising of 50.2 tonnes of chlorpropham (82%), 8.5 tonnes of tecnazene (14%) and 2.2 tonnes of thiabendazole (4%). In farm stores chlorpropham (89%) was the main storage treatment used, 6% of the total tonnage was treated with propham and 6% with pyrethrins. Forty-one tonnes of active substances were used, with chlorpropham accounting for 86% and tecnazene 11%. Thiabendazole, imazalil, pyrethrins and propham accounted for the remainder of the weight of active substances used. At merchant stores chlorpropham was used on 90% of the total tonnage treated, with thiabendazole on 4% and tecnazene on 3%. Merchant stored potatoes were treated with approximately 21 tonnes of active substances. Chlorpropham accounted for the majority of active substances applied, at 73%, with tecnazene at 19% and thiabendazole at 7%. Stated reasons for treatment The main reason given for pesticide usage at farm stores, with 99% of the total tonnage treated (where a reason was given), was to suppress sprouting (Table 6). Chlorpropham accounted for 89% of sprout suppressant usage. Imazalil was applied to 99% of the potatoes treated for disease control. The most important reason given for pesticide applications at merchants’ stores was for sprout suppression (96% where a reason was given), with 4% specifying disease control (Table 7). Chlorpropham was the most widely used sprout suppressant accounting for 96% of all pesticide applications, with tecnazene used on just 3%. There was only a limited use of pyrethrins recorded, presumably for the control of flies in store. Methods of application The methods of application used on farms included thermal fogs (95%), granules (3%) and sprays (2%) (Table 8). The only granules applied were tecnazene formulations. The majority of spray applications comprised of thiabendazole (58%) and imazalil (42%). No dusts were used on ware potatoes at farm stores. Table 9 shows that 92% of all application methods at merchant’s stores were thermal fogs, with chlorpropham accounting for 97% of the total tonnage treated in this manner. Only four percent of applications were sprays and most of these (89%) comprised thiabendazole alone. Granular applications were made to 4% of merchant stored potatoes, with 79% being tecnazene formulations. The only dusts used were tecnazene based. 7
Page 1 and 2: PESTICIDE USAGE SURVEY REPORT 174 P
Page 3: DEFINITIONS a) 'Applications' is us
Page 6 and 7: INTRODUCTION The independent Adviso
Page 8 and 9: METHODS The sample The samples of h
Page 12 and 13: 8 Table 2 Storage methods used for
Page 14 and 15: Table 5 Usage of individual active
Page 16 and 17: SEED POTATOES RESULTS AND DISCUSSIO
Page 18 and 19: Tabe 12 Usage of individual active
Page 20 and 21: Treatment of potatoes at merchant s
Page 22 and 23: SEED POTATOES Storage type The tota
Page 24 and 25: ACKNOWLEDGEMENTS Thanks are due to

Potato Stores in Great Britain - The Food and Environment Research ...

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