To investigate various control measures and to estimate economic injury level of glis glis in olive gardens of Gilan Province
2004
Morovvati, Mohsen | Hassani Moghaddam, Majid | Khakbaz, Jaafar | Afshari, Morteza
Glis glis is one of the most important pests of Olive in Gilan and Mazandaran provinces especially Roodbar city. Annually it causes great losses to this crop. At present the only customary controlling method for this pest is the use of zinc phosphide baits or in grease, which is an acute rodenticide with enormous harmful effects on human health and the environment. Because of this it's very important to find and apply alternative methods of control which could be effective and economical. In this research in order to test various controlling measures five treatments and two control plots were tested in three replications in the form of randomized complete blocks. The treatment groups included, use of anticoagulant rodenticide Kelerat, mechanical control measure using plastic barrier around the tree trunk, integrated use of Kelerat and plastic barrier, use of zinc phosphide baits and the conventional method of zinc phosphide in grease applied on tree trunks. The control plots included complete fencing of the tree with metal mesh (0% damage by this pest) and no fencing and no control measures applied (100% damage by this pest). Results were analyzed using the equation by Prakash (1988) as (%T=100[(S+C)/PV), where calculated T, the percent loss at the beginning of the economically significant damage for the zinc phosphide baits plot was 1.04%, for the Kelerat plot was 1.113%, for plastic barrier was 3.54%, for integrated method of Kelerat and plastic barrier was 3.31% and finally for the conventional method of zinc phosphide in grease was 1.92%, which shows using zinc phosphide stands at the lowest and mechanical method at the highest level of loss and decision making for the commencement of control. The Benefit/cost ratio calculated for different control measures were, zinc phosphide 0.99, Kelerat 1.18, mechanical use of plastic barrier 1.24, integrated use of Kelerat and plastic barrier 1.70 and the conventional method of zinc phosphide in grease 1.17. Statistical analysis of the results showed a significant difference between different controlling measures.
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