Criação, biologia e aspectos da genetica do polimorfismo alar de cigarrinhas-das-pastagens (homoptera: cercopidae)

AUTOR(ES)
DATA DE PUBLICAÇÃO

1985

RESUMO

This study involves the development of spittlebug rearing methods which made possible analysis of the biology and genetics of three different species of this insect. The studied species included Deois sp., Deois schach and Deois flavopicta. The biological parameters analysed were length of mating, longevity, pre-oviposition and oviposition period, fecundity, fertility, egg production along the year and duration of life cycIe (from adult to adu1t). In relation to the nymphal stage, only the duration was determined. Depending of the conditions. two types of eggs were obtained, the normal and the diapause eggs. The incubation period for normal eggs was of 13 days for D. schach and D. flavopicta, and, 17 days for Deois sp. This incubation period for diapause eggs was observed in D.fl.avopicta to vary from a minimum of 60 to a maximum of 263 days. The females of Deois sp. Exhibited a greater longevjty, pre-oviposition period and fertility when compared to the females of the two other species. The total number of eggs laid per female however was not significantly different for any of the species. On the other hand the data indicaty that Deois sp. has a longer oviposition period when compared to D. flavopicta. The eggs obtained from D. flavopicta collected in the area of Monte-Mor, state of São Paulo, during the months of spring and summer were in a high percentage normal, while those collectec1 in the fall months presented a high percentage of eggs in diapause. This shuft was abrupt and occurred in the first ha1f of february of 1985. For Deois sp. the high percentage of normal eggs occurred throughout the year. The polymorphism present in the wing pattern of Deois sp. and D. schach was studied and the data indicates that it should be determined by a few major genes. These however seen to interact among them and affected by modifier genes, and, to a 1essen extent, by enviromenta1 conditions.The analysis of the crosses performed in this work do not allow a conclusive interpretation of the inheritance mecanism of this polymorphism, but one can say that our data does not corroborate the conclusions reached by other authors on the explanation of the wing polymorphism in spitt1ebugs of the northern hemisphere

ASSUNTO(S)

homopteros cigarrinha (inseto) entomologia

ACESSO AO ARTIGO

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