"Our slugs self-fertilise and are so highly inbred they can't keep pace with new diseases and parasites, and together with several other snails may become extinct."
The deluge of slugs and snails has driven a 74 per cent increase in sales of slug pellets at B&Q. Sales of Westland Eraza Slug & Snail Killer have reached a record high - 20 times greater than the same period last year.
Pesticide sales were 92 per cent up last week, because of increased slug and snail activity in the wet at Scotsdales garden centre in Cambridge.
The Prince’s Trust Fulham Palace Garden Centre is holding a free demonstration on Thursday 5 July at 11am to advise gardeners on how to control diseases and pests, such as greenfly and slugs.
The Prince’s Trust Fulham Palace Garden Centre business manager Chris Webb said:
"Pests and diseases can be a real problem for gardeners. We can identify the main outdoor pests and explain how you can control them.
"In some cases garden pests don’t require the use of sprays and it can often be best to let nature take care of the problem."