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1

Imidacloprid applied through drip irrigation as a new promising alternative to control mealybugs in Tunisian vineyards

100%
Mansour R., Youssfi F. E., Lebdi K. G., Rezgui S.
Journal of Plant Protection Research
|
2010
|
tom 50
|
nr 3
Mealybugs are serious insect pests in Tunisian vineyards where they can cause major production losses. Thus, a management program of these insects is a priority for grape growers. A summer pesticide trial was conducted in a vineyard, located in theCap-Bon Region of Tunisia. The trial was carried out to assess the use of imidacloprid, a systemic insecticide, against mealybugs on vine. Imidacloprid was applied through the drip irrigation system for each vine and was then compared to methidathion, a contact insecticide. Imidacloprid was found to be more effective than methidathion on all mealybug developmental stages. In addition to its outstanding, up to 100% efficiency, imidacloprid provided an interesting long-term control of mealybugs. No significant difference was found between the two imidacloprid rates (1 and 2 ml/vine). Methidathion generated an overall low to intermediate efficacy on mealybugs and was more effective on both first instar nymphs and adult females than on the other mealybug developmental stages. Thus, imidacloprid applied through a drip irrigation system is a new promising option to control mealybugs in vineyards. For this reason it can be employed in an integrated management program against these pests in the Tunisian grape-growing area.
2

A survey of scale insects (Hemiptera: Coccoidea) and tending ants in Tunisian vineyards

88%
Mansour R., Mazzeo G., La Pergola A., Lebdi K. G., Russo A.
Journal of Plant Protection Research
|
2011
|
tom 51
|
nr 3
In 2009, two mealybug species Planococcus ficus (Signoret) and Planococcus citri (Risso) and an armoured scale species, Hemiberlesia lataniae (Signoret) were recorded throughout Tunisian table-grape vineyards. P. ficus was by far the most widespread scale insect species within the investigated grape growing areas and was also recorded on fig trees. Among 31 inspected vineyards, 8 were non-infested, 16 slightly to moderately infested, and 7 highly infested by mealybugs. Therefore, the latter are principal pests in vineyards and should be sustainably managed to avoid major crop losses on grapevine. Six ant species were found in Tunisian mealybug-infested table-grape vineyards. They are Tetramorium semilaeve André, Plagiolepis schmitzii (Forel), Tapinoma nigerrimum (Nylander), Crematogaster schmidti (Mayr), Pheidole pallidula (Nylander) and Pheidole teneriffana Forel. The four latter species were reported tending mealybugs on grapevines. T. nigerrimum was found to be the ant most associated with the pseudococcid mealybugs. Our findings are new data for Tunisian grape-growing areas and will contribute to enhance Integrated Pest Management programs in vineyards.
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