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The screening of candidate molluscicides was started in January 1970 to support efforts of State and Federal agricultural workers trying to eradicate the giant African snail, Achatina fulica Bowdich, from Miami, Florida. A. fulica was introduced into Miami in 1966 by an 8-year old boy who returned from a vacation in Hawaii with three A. fulica in his pockets. The molluscicide, metaldehyde, has been used for the control of slugs and snails since it was discovered in the early 1930’s. Metaldehyde has not given a sufficiently high degree of mortality of A. fulica to insure eradication of the pest from Miami. The screening tests in Hawaii were conducted to find other more suitable molluscicides and methods which might aid containment and eradication of the infestation of A. fulica in Miami, Florida. During the screening period (January 1970 April 1973)> 107 compounds were screened. The candidate molluscicides were screened in four phases^ Phase I, Initial Screening Tests] Phase II, Bait Screening Tests] Phase III, Field Tests] and Phase IV, Regulatory Treatment Development Tests. The Phase I, Initial Screening Tests consisted of spreading a solution of candidate molluscicide (90 lbs. a.i./acre) uniformly over the surface of a 12" x 12" glass plate in a 12" x 12" x 3" deep, l" mesh wire cage. Six A. fulica (with shells of 6% whorls, 50-80 mm long) were then placed on the plate for one week. The compounds giving 83-100$ mortality in Phase I were made into 2$ a.i. baits and tested at 3 lbs. a.i./acre in Phase III. vi In the latter part of the testing period, the promising candidate molluscicides were made into 2$, 4$, and 8$ a.i. baits and screened at 3, 6, and 12 lbs. a.i./acre respectively in Phase II. The same cage arrangement used in the Phase I screening tests was used in the screen¬ ing of baits in Phase II. The 2$ a.i. baits giving 66-100$ mortality in the Phase II tests were field tested at 3 lhs. a.i./acre in Phase III. In the latter part of the Phase III test period, the 2$, 4$, or 8$ a.i. baits giving the highest mortality in Phase II tests were field tested at 3> 6, and 12 lbs. a.i./acre respectively as dictated by the mortality results from Phase II. Phase III treatments were replicated three times with 11 adult A. fulica/replication. The chemicals screened consisted of 46 carbamate, 23 organic phosphate, 19 salicylanilide, 6 tin, and 13 miscellaneous compounds. In the Phase I tests, 82.2$ of the carbamate, 66.7$ of the organic phosphate, 21.1$ of the salicylanilide, 80$ of the tin, and 14.3$ of the miscella¬ neous compounds gave 50$ or greater mortality of A. fulica. Forty-eight candidate molluscicides (27 carbamate, 12 organic phosphate, 2 salicylanilide, 3 tin, and 4 miscellaneous compounds) were screened as baits in the Phase II bait tests. Sixteen (59°3$) of the carbamate, 5 (4l.7$) of the organic phosphate, 1 (50$) of the salicylanilide, 2 (66.6$) of the tin, and 2 (50$) of the miscellaneous compounds tested in Phase II gave 50$ or greater mortality of A. fulica. Forty candidate molluscicides (21 carbamate, 9 organo phosphate, 2 salicylanilide, 4 tin, and 3 miscellaneous compounds) were tested in the Phase III field tests. Six (28.6$) of the carbamate, 1 (ll.l$) of

The screening of candidate molluscicides against the giant African snail, Achatina fulica Bowdich (Stylommatophora: Achatinidae)