Biological control of fig scale: From 67% to 100% of scale on twigs sampled in 1954 at colonization sites was found to be parasitized
AuthorRichard L. Doutt
Author AffiliationsRichard L. Doutt is Assistant Professor of Biological Control, University of California, Berkeley.
Hilgardia 8(8):13-13. DOI:10.3733/ca.v008n08p13. August 1954.
Two small colonies of Aphytis “C,” a wasp parasite of the fig scale–Lepido-saphes ficus (Signoret)–released in the San Joaquin Valley, one at Merced and the other near Fresno, demonstrated what is almost an axiom in biological control work: if a parasite is destined to succeed, it will take hold immediately after an adequate release on susceptible hosts.
Also in this issue:Nitrogen on California cotton: Proper fertilization contributes to good return per dollar invested in San Joaquin Valley farms
Design of livestock shades: Construction and location of shades contribute to animal comfort and maintenance of feed intake
Use of moles for subirrigation: Sutter Basin beans adequately irrigated by improved procedures in ditching and use of artificial moles
New pest of ladino clover seed: Cultural practices believed best control of clover case bearer now established in certain counties
Wind machine tests in citrus: Frost protection studies in 1954 confirmed earlier findings next to be investigated in deciduous trees
Valencia fruit sizes increased: Calcium acid phosphate found effective in outdoor cultures of pure silica sand and nutrient solution
Codling moth at linden in 1953: Uccessful control sprays applied in experimental orchard in season of serious infestation at Linden
Temperature and lettuce losses: Variables of time and temperature as they affect deterioration of harvested lettuce investigated
Ornamental flowering plants naturally infected with curly-top and aster-yellows viruses
Weed host range and overwintering of curly-top virus