Fluctuaciones de larvas de cinco especies de Noctuidos de importancia económica asociadas a la alfalfa en el Valle de Lluta

HICHINS, N. O. Y J. E. RABINOVICH

IDESIA

Universidad de Tarapacá

Año: 1974 p. 35 - 79

0718-3429

The population dynamics of fice species of injurious cut -and army-worms (Noctuidae) associated to alfalfa in the Llllta valley was carried on for a full year, on seasonal basis, and with ttoo-uieeks salnpling throughout two different methods, i. e., with a regular insect collecting net and by picking up all worms in one square meter by searched plot. The species involved are, Prodenia eridania, Feltia subterranea, Copitarsia consueta, Heliothis zea and Spodoptera frugiperda. The fields sampled uiere six, along 42 kms. in the Lluta valley, with Lluta I receiving no insecticide treatment at all throughout the whole year, while Llttta II, III, IV, V and VI were regularly treated usith. organic insecticides. The research shows the relative importance of each species in the different fields and seasons; the variations during the different seasons, being more harmful in Summer and Fall than Winter and Spring; and a definite relation to the growth of alfalfa in the same seasons.