Data to the interrelationship of damages caused by the lucerne seed chalcid bruchophagus roddi and the lucerne seed weevil tychius flavus

Erdelyi, C.; Szentkiralyi, F.; Manninger, S.

Acta Phytopathologica Academiae Scientiarum Hungaricae 14(1-2): 201-208

1979


ISSN/ISBN: 0001-6780
Accession: 005091807

Download citation:  
Text
  |  
BibTeX
  |  
RIS

Article/Abstract emailed within 1 workday
Payments are secure & encrypted
Powered by Stripe
Powered by PayPal

Abstract
Investigation of pod samples taken from 30 micro-plots in a lucerne stand grown for seed at Kompolt, Hungary, 1977, showed 47 and 15% damage caused by the seed chalcid (B. roddi) and the seed weevil (T. flavus), respectively. There was close reciprocal correlation between damages made by both pests. As a result of detailed examination on 9 of the samples, there was some indication of differences in oviposition preference to the size of pods. The peak number of pods and seeds damaged by Bruchophagus and Tychius fell to the 4- and 6-seeded pods, respectively; the proportion of pods infested by Bruchophagus increased rapidly to the 3-seeded pod-level but remained unchanged in larger ones, while that of pods infested by Tychius increased continuously. The 2 spp. often occurred in the same pods and the presence of seeds infested by Bruchophagus and chewed by Tychius showed competition between them. The increase of the number of seeds per pod increased the number of seeds damaged by both pests from repeated oviposition, and in the case of Tychius, from damaging more seeds in larger pods. The proportion of damaged seeds in the infested pods, characterized by increasing seed number, decreased steadily.