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Well with out more info it may be hard to tell like what type of casing your usingetc ,ive found that contams can be lowered by using calcin lime in peat based casings also use of same in dung subshelps sum ,humidity too high invites contams along with stale air [not fanning enough]temps overly high ?these alone or in combination can be causes of the green imowe can prolly rule out improper or un steril technique since you've had success in the winter ,i'd bet one or a combination of the above are prolly a good place to start looking though .