Krsteska, Vesna and Stojanoski, Petre (2016) Helicoverpa armigera on tobacco. Тутун-Tobacco, Vol 66, No 7-12, p. 42-50;, 66 (7-12). pp. 42-50. ISSN ISSN 0494-3244
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ABSTRACT
Helicoverpa armigera Hubner is an economically important agricultural pest well adapted in tobacco areas. The
larvae feed on reproductive organs of tobacco plants causing severe damages on tobacco seed.
The population of H. armigera was visual investigated throughout the summer and beginning of autumn, 2015/2016
in tobacco field in Prilep, with application of the method check of 100 tobacco stalks. The investigations of tobacco
stalks attacked by H. armigera larvae are made in three replications in middle/margin plots. Field and laboratory
trials were carried out for control of H. armigera, with four insecticides: Chlorcyrin 550 EC (a.i chlorpyrifos 500
g/l + cypermethrin 50 g/l) 1.5 L/ha; Alverde (a.i metaflumizone 240 g/l) 1 L/ha; Affirm (a.i еmamectin 9.5 g/kg) 2
kg/ha and Belt 24 WG (a.i flubendiamide 480g/L) 25 g/100L.
Population dynamics of H. armigera shows that the species is present on tobacco from the beginning of July until
the end of tobacco vegetation. It was observed that larval densities on tobacco plants were significantly higher at
the margins of the fields than in the centre.
Plants should be checked regularly for eggs or young caterpillars. All insecticide applications are really effective
when larvae are small. Larvae during L5 and L6 consume about half of their overall diet. They burrow into the seed
capsules where they become less accessible to insecticides.
According filed trials and laboratory investigations during 2015/2016, all applied insecticides showed high effectiveness in H. armigera control. The highest average mortality of 100% was caused by Affirm.
Direct damage of the larvae on flowers, seed capsules and top leaves resulted in low tobacco seed yield. Chemical
control is still the most reliable and economic way of protecting tobacco crop from H. armigera.
Keywords: tobacco, H. armigera, population, chemical control
| Item Type: | Article |
|---|---|
| Subjects: | Scientific Fields (Frascati) > Agricultural Sciences > Agricultural biotechnology |
| Divisions: | Scientific Tobacco Institute |
| Depositing User: | Prof d-r. Vesna Krsteska |
| Date Deposited: | 26 Dec 2023 11:13 |
| Last Modified: | 26 Dec 2023 11:15 |
| URI: | https://eprints.uklo.edu.mk/id/eprint/8708 |
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