Extension laboratory, U.C., Davis

Also in this issue:

Agricultural field stations —laboratories of the university

Influence of weather on the harvesting of high elevation christmas trees

Resistance to sun blotch virus in seed source trees of Duke avocado

Testing fluorine compounds for chemical mowing of turfgrass

Preplant soil fumigation increases head weights in California lettuce

Mechanical aids to sweet potato harvest

Interaction of environment and genotype in the expression of a virescent gene, pale-yellow-1, of maize