. Commercial mass culture of the California red scale parasite : Aphytis lignanensis. Citrus; Scale insects. laboratory in the control of a pest-para- site population in the oleander-scale culture during an eradication program. The immediate and residual effects of pyrethrum on oleander scale. Aspidioti- phagus sp. (the contaminant), and on the host plant (banana squash) have been investigated. The pyrethrum source was a commercial aerosol bomb which util- ized soybean oil as the carrier and freon as the propellant. Dosage was measured in the number of seconds during which the aerosol was perm
. Commercial mass culture of the California red scale parasite : Aphytis lignanensis. Citrus; Scale insects. laboratory in the control of a pest-para- site population in the oleander-scale culture during an eradication program. The immediate and residual effects of pyrethrum on oleander scale. Aspidioti- phagus sp. (the contaminant), and on the host plant (banana squash) have been investigated. The pyrethrum source was a commercial aerosol bomb which util- ized soybean oil as the carrier and freon as the propellant. Dosage was measured in the number of seconds during which the aerosol was permitted to escape into a space of 1,000 cubic feet. Dosages rang- ing from 2 seconds per 1,000 cu. ft. to 20 seconds per 1,000 cu. ft. were used. The results of this series of tests indi- cated that a dosage of 6 seconds per 1,000 cu. ft. did maximum damage to the pest- parasite population and minimum dam- age to the scale. This treatment showed no measurable effect on the surface of the squash. Scale crawlers and newly settled scale were susceptible to the pyre- thrum treatment. However, after the scale reach 14 days of age or older, treatment at this dosage produces no ill effects. The adults of the pest parasite present at the time of treatment were completely susceptible to the aerosol, and the residue on the upper surfaces of horizontal planes is adequate to kill them for periods of at least 24 hours. These factors indicate the excellent potential which this in- secticide may have in the control of a pest-parasite population during an eradi- cation program. The effects of pyrethrum treatment ap- plied in the scale-production area upon later oviposition by Aphytis lingnanensis in the parasite-production area were in- vestigated. Oviposition by Aphytis on untreated squash was compared to that on treated squash where the residue ranged in age from 1 day to 10 days from the last day of treatment. Results are shown in graph 7. A marked differ- ence in production of parasite proge
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