Fall is a time for many farmers to harvest crops that will be distributed around the world and brought to our own table. Christians in the past would use this time to give thanks to God for the harvest and to ask for his protection.
Here is a prayer from the Roman Ritual that can be used to invoke God’s protection over the harvest.
Lord God almighty, who never fail to bestow on men an abundance of heavenly gifts, as well as the rich fruits of the earth; we give thanks to you in your glory for this harvest of grain, and beg you again to bless the harvest which we have received from your bounty, to preserve it and to shield it from harm. Grant also that, having had our desire for earthly needs filled, we may bask under your protection, praise your kindness and mercy without ceasing, and make use of temporal goods in such a way as not to lose everlasting goods; through Christ our Lord.