Calag Archive

Grape varieties established in areas having such pests as phylloxera or nematodes must be budded or grafted onto a suitable resistant rootstock.

Sprays of standard lead arsenate for first brood grape leaf folder control and parathion dusts for second and third brood controls have generally given the best results in trials carried out during the last three years.

The following article is the second of two progress reports on cantaloupe crown blight studies.

Heat released by ice forming from water sprinkled on plants—that can carry the ice load—appears to be an efficient means of frost protection.

Russet of Bartlett pears was not increased by the cluster-bud spray or bloom period dusts applied in test orchards during the spring of 1956.

Psorosis—scaly bark—is a progressive disease which may take several years to render a tree unprofitable or completely nonproductive. Nevertheless, it can take a bearing tree out of production faster than replants can be brought into production.

The citrus nematode—Tylenchulus semipenetrans—is known to be in the 14 counties of California where there are commercial plantings of citrus. The nematode is a parasitic pest that feeds on the roots of citrus trees. Its feeding decreases vigor and rate of tree growth and the yield and size of fruit. The nematode does not kill the trees but may reduce growth of young lemons and oranges by 40% to 60%.