<text>  Shoppers have found venomous redback spiders hiding in bags of Australian-grown green grapes in four separate instances over the past two weeks. And grape suppliers admit the spiders are difficult to eliminate because they have the ability to hold their breath when sprayed with insecticide. A mother found a spider in a bag of Thompson Seedless grapes she bought at the Woolworths in Thornleigh, in Sydneys northwest, on Thursday. This comes after another man found two redbacks in a bag of grapes he bought at a Gold Coast Woolworths on Tuesday and a woman in Auckland, New Zealand found a redback in a bag of imported Australian grapes she purchased from the Woolworths-owned Countdown supermarket chain less than two weeks ago. Scroll down for video . Gold Coast woman, Leigh Alexander-de Jersey, said she was shocked to find a redback amongst grapes she bought from a fruit shop at Southport Park Shopping Centre on the Gold Coast on Friday . Gold Coast man Mike ONeill said he found two redbacks in a bag of grapes he bought at the Australia Fair Woolworths at Southport on Tuesday . A mother found a spider in a bag of Thompson Seedless grapes she bought at the Woolworths in Thornleigh, in Sydneys northwest, on Thursday. And another Gold Coast woman, Leigh Alexander-de Jersey, said she was shocked to find a redback amongst grapes she bought from a fruit shop at Southport Park Shopping Centre on the Gold Coast on Friday. It wasnt until I had picked it up by a leg and it started to wriggle around and turn that I realised what it was and dropped it real quick, Ms Alexander-de Jersey told Daily Mail Australia. I initially thought it was just a part of the grape stem. It had been in the fridge for a few hours prior to me washing them, we think that has possibly slowed it down a bit and luckily for me it was a bit lethargic. This comes as Gold Coast man Mike ONeill said he found two redbacks in a bag of grapes he bought at the Australia Fair Woolworths at Southport. A Woolworths spokeswoman said they were investigating the Thornleigh and Southport incidents, but would not reveal the names of the grape suppliers for each supermarket . Auckland woman Debbie Bellingham was forced to call New Zealands biosecurity hotline after finding a redback spider in a bag of imported Australian grapes she purchased at Woolworths-owned Countdown . There was a redback spider crawling on my hand, Mr ONeill told the Gold Coast Bulletin. I flicked it off it was a bit comical because Im absolutely terrified of spiders. And Auckland woman Debbie Bellingham was forced to call New Zealands biosecurity hotline after finding a redback spider in a bag of imported Australian grapes she was going feed her three-year-old-daughter, the New Zealand Herald reported. My daughter came down to me and goes, Mummy, theres a funny looking spider in the grapes, its black and sort of orangey-red, Ms Bellingham told the Herald. An Australian grape supplier, who wished to remain anonymous, said redbacks were prevalent in the grape industry but they were very difficult to eliminate. The redbacks live on the timber, the wood of the vine, he said. Growers do take every precaution to make sure theyre limited by a spraying insecticide, but the unfortunate thing with redbacks is they have the ability to hold their breath for 10 hours. An Australian grape supplier, who wished to remain anonymous, said redbacks were prevalent in the grape industry but they were very difficult to eliminate . When they know the insecticide is being sprayed they hold their breath making the insecticide useless. He said the only thing that definitively kills redbacks is keeping the grapes at freezing temperatures for 24 hours. Its something that cant be eliminated it just needs to be heavily scrutinised, he said. Every precaution is taken its just virtually impossible to eliminate 100 per cent. Australian Table Grape Associations chief executive Jeff Scott said it was not normal for redbacks to be found amongst grapes. Thats disappointing and unexpected... that shouldnt happen, Mr Scott said. Australian Table Grape Associations chief executive Jeff Scott said it was not normal for redbacks to be found amongst grapes. Shoppers have found venomous redback spiders hiding in bags of Australian-grown green grapes in four separate instances over the past two weeks . Thats disappointing and unexpected... that shouldnt happen, Mr Scott said. A Woolworths spokeswoman said they were investigating the Thornleigh and Southport incidents, but would not reveal the names of the grape suppliers for each supermarket. We are looking into these incidents and will be in touch with our supplier to ensure they are following the correct quality processes, she said. We source our grapes from a number of suppliers. A Countdown spokeswoman would not release the names of the supermarkets grape suppliers. We source green grapes from a number of growers in Australia and also from the market here in New Zealand, she said. We generally dont disclose the information of individual suppliers as its commercially sensitive. 