| Autor: |
Woglum, R. S., LaFollette, J. R. |
| Zdroj: |
Journal of Economic Entomology; October 1925, Vol. 18 Issue: 5 p726-726, 1p |
| Abstrakt: |
Fumigation with hydrocyanic acid gas was successful in black scale control everywhere in California up to about 1910. Increased resistance to cyanide gas has developed and so spread as to seriously affect pest control over a thickly planted citrus area more than 30 miles long. Three sprays have shown results superior to fumigation. These sprays also control the citrus red spider against which fumigation is ineffective. Thorough sprying is essential. While fumigation gives practically uniform scale kill in all parts of the tree, top results have not been entirely satisfactory with sprays. The use of towers has greatly improved top spraying. Spraying averages about two-thirds the cost of fumigating. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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