The results of the laboratory experiments on the influence of soil temperature and humidity on some fragments of biology of the lucerne flower gall midge

Romankow, W.

Prace Naukowe Inst Ochrony Roslin 4(2): 133-151

1962


Accession: 025920242

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Abstract
Experiments were carried out during 1958-1960 to check the effect of temperature and humidity on development of larval cocoons and number of adult flies of the over-wintering generation. The following problems were included: (1) Effect of increased temperature during diapause of overwintering generation, (2) effect of soil humidity on development of larval cocoons and period of adult emergence of overwintering generation, (3) resistance of larval cocoons against low humidity during larval diapause, (4) effect of soil humidity on larval development and number of adults of summer generation. It was found that increased temperature stimulated development of overwintering forms, shortened period of diapause and accelerated emergence of adults. Low humidity of soil (20% of capillary volume) inhibited development of overwintering forms, reduced number of adults and emergence of adults was late. Very high soil humidity (100% of capillary volume) resulted in 100% reduction of overwintering adults. Humidity of soil 40-80% favored development of overwintering forms and larvae of the summer generation. This was indicated by the great number of emerging adults. Effect of low or high humidity was revealed after a longer period of time (60, 75 days). Short dry periods (less than 30 days) or high humidity (less than 14 days) had little reducing effect on number of adults of overwintering generation.