Development of rice weevils (Sitophilus oryzae L.) and lesser grain borers (Rhizopertha dominica F.) on kernels and spikes of spelt wheat
2010
Almasi, R., Faculty of Agriculture, Novi Sad (Serbia) | Bodroza-Solarov, M., Faculty of Technology, Novi Sad (Serbia) | Posloncec, D., Faculty of Agriculture, Novi Sad (Serbia)
This research deals with the possibility of nutrition, development, survival and reproduction of primary wheat pests, rice weevils (Sitophilus oryzae L.) and lesser grain borers (Rhizopertha dominica F.) on kernels and spikes of spelt wheat. The rice weevils reproduced on all the three varieties of spelt wheat stored in kernels and the number of the offspring of F1 generation was 141.6 imagoes on average. The average number of lesser grain borer offspring was 45.0. The number of lesser grain borer offspring on grains was smaller in comparison with the number of rice weevil offspring under the same storage variation. Rice weevils cannot feed and reproduce on any variety of spelt wheat when stored in spikes. In the same storage variation the lesser grain borers fed and reproduced although the average number of offspring was small (14.3 imagoes). On the spelt wheat in spikes the number of lesser grain borer offspring was smaller compared with those in kernels. On all the three varieties f spelt wheat in the mixture of kernels and spikes there were the offspring of both rice weevils and lesser grain borers. The average number of the imagoes of rice weevils was 135.3 and the number of lesser grain borers was 48.0. Based on the analysis of kernels and spikes, rice weevils developed only on kernels opposite to the lesser grain borers which normally developed on both kernels and spikes. The results show that the impossibility of rice weevil nutrition resulted from the physical impossibility of nutrition and not from the repellent spike effect.
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