Control of sunflower moth larvae and damage to sunflower seeds
AuthorElmer C. Carlson
Author AffiliationsElmer C. Carlson is Specialist, Department of Entomology, University of California, Davis.
Hilgardia 22(7):6-8. DOI:10.3733/ca.v022n07p6. July 1968.
Investigations on the control of the sunflower moth, Homoeosoma electellum (Hulst), conducted over several seasons indicated that certain insecticides can satisfactorily reduce sunflower head and seed damage when multiple applications are properly timed. Of the commercially available materials tested, endosulfan and diazinon afforded the most efficient control. Treatments must begin at onset of bloom, and three applications at intervals of 5 to 7 days gave optimum results. Two applications were the minimum required, but three were generally needed because of the fast head growth, quick flowering, and concentrated egg deposition during this period. The biological agent Bacillus thuringiensis, was found unsatisfactory for control. Only GS 13005 (of several new experimental chemicals tested) gave outstanding control. One larva could severely damage nine or more seeds, and moderate to severe infestations of 12 to 24 larvae per head caused serious seed loss. Pesticide control was usually necessary, but the actual amount of damage varied from season to season.
Also in this issue:Supplemental feeding of honey bees
Sugar beet yield variation with soil type in Solano County
The rural community and OEO-financed housing for families of migrant farm workers
Response of six barley varieties to selected cultural practices
Soluble salts in drainage waters and soils of recent citrus plantings in southern California
Chemical induction of fruit abscission in olives
A guide to the spider mites of cotton