Spreader surrounds differ from spreader rows in that they surround the screening population rather than run through it. They are used when parasite gradients are not a problem. Spring and winter cereals
Spring cereals are sown in the spring, as soon as the land is dry enough to take a tractor. Winter cereals are sown in the previous Fall, and they have the advantage of being several weeks ahead of the spring cereals. Breeding for winter hardiness is very similar to breeding for horizontal resistance. A heterogeneous population is sown in the Fall, and only those individuals that survive the winter can be screened the following summer. Nature does the breeding work for us. Spruce
See: Picea spp. Squash
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