. Cooperative economic insect report. Beneficial insects; Insect pests. - 909 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES CABBAGE LEAF MINER (Phytomyza rufipes Meig.) Economic Importance: Larvae of this agromyzid cause serious damage to young crucifers, especially cauliflower and cabbage in England, In 1935 yoimg cauli- flower plants in German Silesia were infested by 20 to 25 larvae each. The larvae mine in the midribs of cauliflower leaves but the most serious damage to yoimg plants is caused by larvae boring in the heads. In mature plants, injury may occur in the leaf stalks, but does
. Cooperative economic insect report. Beneficial insects; Insect pests. - 909 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES CABBAGE LEAF MINER (Phytomyza rufipes Meig.) Economic Importance: Larvae of this agromyzid cause serious damage to young crucifers, especially cauliflower and cabbage in England, In 1935 yoimg cauli- flower plants in German Silesia were infested by 20 to 25 larvae each. The larvae mine in the midribs of cauliflower leaves but the most serious damage to yoimg plants is caused by larvae boring in the heads. In mature plants, injury may occur in the leaf stalks, but does not extend to the stems. Hosts: Attacks crucifers, especially cauliflower and cabbage in England. Also damages horseradish, rape, endive, kohlrabi and turnip. Apparently of little importance on wild host plants. Distribution: Recorded in Great Britain, Ireland, Netherlands, Belgium, Germany, Denmark, Norway, Italy, Austria, Sweden, Switzerland and Silesia (Poland, Czechosklovakia).. General Distribution of Phytomyza rufipes Life History and Habits: There are apparently 3 or 4 generations a year in England, adults being common from May until October. Eggs are inserted in the tissue of the leaf blade of host plants, the place of oviposition being marked by a small whitish ring. The larvae live mostly in the midrib and leaf bases, occasionally being found in the stem and growing points of young plants. The winter is passed in the pupal stage in the soil. (Agromyzidae, Diptera) No. 94 of Series. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Animal and Plant Health Service. Plant Protection and Quarantine Programs; United States. Bureau of Entomology and Plant Quarantine; United States. Plant Pest Control Division. Hyattsville, MD. [etc. ] Plant Protection and Quarantine Programs Animal and Plan
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