John Calvin Commentary Deuteronomy 28:15

"But it shall come to pass, if thou wilt not hearken unto the voice of Jehovah thy God, to observe to do all his commandments and his statutes which I command thee this day, that all these curses shall come upon thee, and overtake thee." — Deuteronomy 28:15 (ASV)

But it shall come to pass, if you will not hearken. This list of curses is longer than the previous one proclaimed from Mount Sinai, undoubtedly because the Spirit of God foresaw that the sluggishness of the people needed sharper stimulants.

If they had been only moderately teachable, what they had already heard would have been even more than sufficient to alarm them. But now God redoubles His threats against them in their inertness and forgetfulness, so that they might not only be compelled to fear but also be aroused by constant reminding.

For this reason, He declares that they would be cursed in the city and in the field, that is, at home and abroad, in the house or out of the house; and again, that their food would be cursed in the seed and in the meal.

Afterwards, He enumerates three kinds of fruit in which they would be cursed: namely, their own offspring, the produce of the soil, and the young of their animals. For Scripture includes all these in the word fruit, as clearly appears from this passage.