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The study was set up to gain information on the effective dispersal of maize pollen and the degree of randomness in mating.The results show that plants near the source tend to receive a greater quantity of pollen than those further away. It was further observed that the effective pollen dispersal was not uniform in all directions. In addition, the distance measured in number of plants is more important in assessing the efficiency of pollen dispersal than the distance in meters.The findings indicate that maize is indeed a panmitic population, in which a great number of parents or the male gametes are considerably mixed.

SUMMARYSineacar is a powder made of a mixture of chlor and brom propylate, tedion and cellulose or glucose. 9 colonies were treated twice at 10 days intervals with 100 grams dusted over the combs. 5 colonies served as controls. The degree of infestation was determined before and several times after treatment.The results showed no difference between treated and untreated colonies.

The number of sensilla campaniformia and sensilla coeloconica + sensilla ampullacea of flagellomeres 2 to 11 of the antennae of three types of males (Italian, African and Africanized) was determined by scanning electron microscopy. Comparison of the three male types showed that Italian males did not differ from African males in number of sensilla coeloconica + sensilla ampullacea and that both differed from Africanized males in terms of flagellomere 11. With respect to flagellomeres 3 and 10, Italian males were similar to Africanized males and both differed from African males. No differences between the three male types were detected in the other flagellomeres. In relation to the number of sensilla campaniformia Italian males differed of the African and Africanized males with respect to flagellomere 11.Key words: antennae, flagellomeres, sensilla, Apis mellifera. RESUMO Diferenças no número de estruturas sensoriais antenares de machos de 3 tipos de abelhas melíferasO número de sensilla campaniformia e sensilla coeloconica + sensilla ampullacea dos flagelômeros 2 ao 11 das antenas de 3 tipos de machos (italianos, africanos e africanizados) foi estudado através do microscópio eletrônico de varredura. As comparações dos 3 tipos de machos mostraram que, em relação ao número de sensilla coeloconica + ampullacea, os italianos não diferiram dos africanos e ambos eram diferentes dos africanizados em termos do flagelômero 11. Em relação aos flagelômeros 3 e 10, os italianos eram semelhantes aos africanizados e ambos diferiram dos africanos. Nos outros flagelômeros não foram verificadas diferenças entre os três tipos de machos. Em relação ao número de sensilla campaniformia, os italianos diferiram dos africanos e dos africanizados quanto ao flagelômero 11.Palavras-chave: antenas, flagelômeros, sensilla, Apis mellifera.

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Data are analyzed on an aspect of aggressiveness in workers from colonies of Africanized bees (Apis mellifera adansonii), Italian bees (Apis mellifera ligustica), their F1 hybrids, and backcrosses of the F1 to the parental stocks (Rothenbuhler method). The segregation values (3:1) in the backcrosses to the Africanized stock and nonsegregation in the backcrosses to the Italian stock suggest the existence of two pairs of genes (F1/F1; F2/F2 IN THE Italian bees and f1/f1; f2/f2 in the Africanized bees) which control a character defined of the number of stings in the gloves of the observer.