All Issues

Viruses affect at least 10 different orchid genera.

Three major fields of chemical weed control are open for further development: the uses of temporary soil sterilants, permanent soil sterilants, and translocated herbicides.

Spectrographic methods revealed that nickel is extremely toxic to citrus plants.

Asparagus breeding is a long-term research activity. Not until eight to ten years after a cross has been made is the plant breeder able to determine whether he has been successful in combining the characteristics of the male and female parents in the way that he hoped. Meanwhile daily yield records must be taken from harvests during a two- to three-month period each spring. These must include the number and size of all spears produced by every plant, as well as a catalog of various desirable characteristics. Individual plant records show a wide variation between plants in these characters.

The tomato plant is subject to attack by insects from the time it is planted until the crop is harvested.

Soil fumigation with technical chlorobromopropene—CBP-55—offers considerable promise for control of Verticillium wilt and black root rot of strawberry.

Not all commercial groves treated with parathion develop abnormally high populations of soft brown scale but where populations do increase they usually are extensive and have definite characteristics in comparison to populations found in groves not treated with parathion.

The application of spray chemicals to deciduous fruit orchards by the semi-concentrate and concentrate methods has resulted in a saving of about 70% in labor costs, and some 20% in materials.