Calag Archive

Twelve irrigation canals, sampled repeatedly for one year, all harbored one or more of the species of Phytophthora that cause citrus diseases. The species that were prevalent varied with the seasonal temperature of the water. The fungus was found in only one of the three reservoirs tested.

Foliage sprays of magnesium nitrate at 10 pounds per 100 gallons of water– applied in citrus plots when the spring flush of growth was about two thirds expanded–substantially increased the magnesium concentrations in the leaves. After trees were sprayed, further development of magnesium deficiency symptoms was checked. Within six months, leaves with symptoms at the time of spraying had dropped and sprayed trees were then practically free of symptoms. Leaves which had shown no deficiency became deeper green than similar leaves on nonsprayed trees.

Inter-row planting as a practical management practice for the protection of while asparagus fields from wind erosion has been intensively studied since 1955. Such erosion is sometimes costly to the growers and is an important factor in peat dust storms.

New treatments for control of lygus bug–Lygus hesperus Knight–should be evaluated in terms of their effects on beneficial as well as harmful insects.

Physiological adaptation–the ability to change so as to live more or less normally in a previously unfavorable or stressing environment–is one of the most universal properties of living things. However, the native ability of animals to adjust to variations in their environment has to a large extent been sacrificed in breeding animals for modern high standards of production.

Alfalfa pellets hand-fed to weaner beef heifers at the rate of 1.5 pounds or more per head per day were as effective in promoting weight gains as were cottonseed meal pellets fed at the same rate. However, when the daily feeding rate was only 1.0 pound per head per day, the heifers gained more on cottonseed meal pellets than on alfalfa pellets.

Proper timing and selection of insecticides determine the effectiveness of sprays against the fowl tick, Argas persicus (Oken).

Newest among the several types of equipment developed to study the harvest of canning tomatoes–where hand labor constitutes 88% of the cost–is a wheelbarrow harvester.

Out-of-season tomato production varies unpredictably as to yield and fruit quality.

Losses from bacterial soft rot are most prevalent in winter, when atmospheric conditions are such that potatoes remain wet or damp after washing and packaging. Experiments have shown that the disease develops rapidly when relative humidity is 90% or higher and temperature is 60 °F or warmer, and that it can be prevented by drying potatoes after washing.