. Cooperative economic insect report. Beneficial insects; Insect pests. - 1096 - STATUS OF THE SCREW-WORM (Cochliomyia hominivorax) IN THE SOUTHWEST No screw-worm cases reported from TEXAS during period September 13-19; last case reported August 2 in Irion County. Two cases reported from Grant+ County, NEW MEXICO, are first since July. In ARIZONA, 9 cases reported: Yavapai (2) , Cochise+ (3) and Santa Cruz+ (4) Counties. Mexico reported 47 cases in States of Chihuahua (18) , Sonora (18), Durango (7) and Tamaulipas (4) . Sterile screw-worm flies released: Texas 21,254,250, New Mexico 3,580,000,
. Cooperative economic insect report. Beneficial insects; Insect pests. - 1096 - STATUS OF THE SCREW-WORM (Cochliomyia hominivorax) IN THE SOUTHWEST No screw-worm cases reported from TEXAS during period September 13-19; last case reported August 2 in Irion County. Two cases reported from Grant+ County, NEW MEXICO, are first since July. In ARIZONA, 9 cases reported: Yavapai (2) , Cochise+ (3) and Santa Cruz+ (4) Counties. Mexico reported 47 cases in States of Chihuahua (18) , Sonora (18), Durango (7) and Tamaulipas (4) . Sterile screw-worm flies released: Texas 21,254,250, New Mexico 3,580,000, Arizona 4,900,000 and Mexico 49,385,200. Table 1. Comparison of specimens reported during corresponding weeks in 1962 and 1963 in Southwestern Eradication Area. Ratio of Positive Cases Positive Cases Negative Cases* to 100 Cases Negative** Year Current Cumulative Current Cumulative Current Cumulative 1962 1963 1964 1,201 189 2 36,838 2,972 109 33 151 45 2,372 5,019 4,487 3,639,3 1, Table 2. Comparison of specimens reported during corresponding weeks and in a corresponding area in 1963 in the United States-Mexico Barrier Zone*** Year Positive Cases Current Cumulative Negative Cases* Current Cumulative Current Ratio of Positive Cases to 100 Cases Negative** Cumulative 1963 1964 211 58 2,928 2,170 27 18 1,036 1,497 + Counties in United States portion of Barrier Zone, * The number of cases not screw-worm is an index of the efficiency of the reporting system. ** A comparison of the ratios of screw-worm cases with cases not screw-worm is an index of the change in number of screw-worm cases, *** Barrier Zone - Area in which screw-worm eradication operations are being carried out in an effort to prevent establishment of a self-sustaining screw-worm population in the United States. (Anim, Dis. Erad. Div.). 'Igures - Number of cases reported V' i â jf- In Infested counties for ^J / period September 13 - 19 ''*'n*' â ⢠ââ¢â Limits
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