Hi. We get that in wheat but it would be pretty rare in barley. Everyone does a flowering spray on wheat to prevent it.Very common here in Canada it’s fusarium head blight. Here it will render the grain notacceptable fir pig feed because it will induce abortion in sows and reduced feed intake on feeder pigs To the extent they won’t eat at all. Beef dairy and chicken are able to consume without any issues. Suppression of it is possible with a suitable fungicide at early flowering. Wheat barley and to some extent oats are all effected. Yields are greatly reduced as the portion of the head above the infected site can be starved of the nutrients to fill the grain. High humidity and warm conditions running up to flowering and rotation all play a major roll in fusarium infection levels. some varieties have more resistance than others but none are perfect. It’s a major quality issue in western Canada.
I thought the same until this morning . Didn't notice anything 10days ago at T2 but did see some wee beasties today and haven't used any insecticide . Dunno if it's linked .Concerto was bad for this. I have not had the same problem since switching to Diablo.