Collocations for disastrous - adj.

be, prove
become

absolutely, completely, quite, truly, utterly
The policy was absolutely disastrous for the economy.

fairly, pretty
potentially
ecologically, economically, environmentally, financially, politically
equally
This could have equally disastrous consequences.

Disastrous is used with these nouns:
consequence, defeat, effect, failure, fire, harvest, holiday, impact, marriage, mistake, policy, result, run, season, showing, slump, start