Phthorimaea operculella (Zeller) pest control on tobacco

Krsteska, Vesna and Lazarevska, S. and Tashkoski, Petre and Stojanoski, P. (2016) Phthorimaea operculella (Zeller) pest control on tobacco. In: 2 nd International Symposium for Agriculture and Food, Skopje, Macedonia.

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Phthorimaea operculella is an oligophagous pest, whose larvae feed on Solanaceae family. We observed P. operculella as pest in commercial tobacco fields in three locations in Varos -Prilep (2010-2012) during the entire tobacco vegetation. Investigations were carried on 100 tobacco stalks per location. Four insecticides were tested against larvae, in field and laboratory conditions. These insecticidal chemical compounds belong to different groups: chlorpyrifos+cypermethrin, deltamethrin, methomyl, chlorpyrifos. P. operculella is a small brown to light grey moth (approximately 9 mm long with a 14 mm wingspan). The young larva is flexible and active. The neonate body is light brown, and shifts to green or pink in later instars. After hatching the larvae are 1.2 to 2 mm long. The larva grows to a length of about 1-1.4 cm. Monitoring of P. operculella is one of the most important components of an integrated pest management (IPM). Larvae create tunnels in tobacco leaves, feeding on parenchyma and leaving only the upper and lower epidermis. The tunnel can reach about 11 cm in size. The damaged leaf tissue dies and leaves the leaf with a split appearance, reducing quality and therefore, causing economic loss. In Varos, in 2012 we observed increased damage caused by P. operculella on tobacco (35.28% attacked tobacco stalks). As in-field population increases, ten or more mines can develop on an individual tobacco plant. Larvicidal effect of deltamethrin and chlorpyrifos+cypermethrin yielded 100% mortality of caterpillars from the second age group in laboratory conditions, followed by chlorpyrifos (96.7%) and methomyl (90.0%). Larvae spend their entire lifetime in tunnels and with the removal of lower leaves will stop the larvae development inside leaf mines and thereby reduce their field populations. Other IPM recommendations are: determine of damage threshold, use of pheromone traps, planting only healthy tobacco stalks, biological control, autumn plowing etc.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: tobacco, Phthorimaea operculella, pest control.
Subjects: Scientific Fields (Frascati) > Agricultural Sciences > Agriculture, forestry and fisheries
Divisions: Scientific Tobacco Institute
Depositing User: Ms Biljana Jordanoska
Date Deposited: 08 Oct 2016 23:20
Last Modified: 08 Oct 2016 23:20

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