Too early to speculate on this but rewind 30 years, 1991 pinatubo erupted and here in japan the government decided to buy rice from Thailand. Everyone was using rice cookers already back in 1993 when this happened and because that type of rice requires different water amount and time(which nobody here knew or was willing to experiment too much around) there was a lot of wasted rice. In the end there was no real need to buy it at the time, everyone did survive and domestically grown rice was in enough supply, so probably no need to think about it now either.
Generally speaking, as we don't know how big this eruption was we can't tell anything yet but chances are this may result in damage to crops, particularly in asian region where the wind is blowing this ash cloud right now. The cloud doesn't really look that bad to me judging from himawari-8 daily images. I mean, not bad enough to make the world cooler this year. But more dust around the globe for sure.