Citrus infestation by the black scale,Parlatoria ziziphiLucas (Homoptera: Diaspididae) in Tlemcen, Algeria

Abstract

The study of citrus infestation by the black scale Parlatoria ziziphi Lucas 1853 (Homoptera, Diaspididae) is realized between 2012 and 2013 on two citrus varieties (Thomson and Portuguese) in El Fehoul station in Tlemcen in the NorthWest of Algeria. This study shows that Parlatoria ziziphi is present in both varieties and the upper surface of leaves is is always more infested than the lower surfacess. In terms of leaves infestation rates, it's very important at the southern exposure and the center of the plot for Thomson variety and with 100 % in the southern and northern exposure of the Portuguese variety. The rate of fruit fruit infestation is the most important in the south with 87.9 % for Thomson variety and 79 % for the Portuguese variety. The infestation rate of the leaves does not change after harvesting the fruit. This species of scale insect is cosmopolitan and it attacks many species of Citrus family. It is also very common on citrus in Algeria.

Seasonal Occurrence of Parlatoria ziziphi (Lucas) and Its Parasitoid in Relation with some Climatic Factors and Chemical Components on Navel Orange Trees التواجد الموسمى لحشرة parlatoria ziziphi (Lucas) وطفیلها الحشرة فى علاقه مع بعض العوامل المناخیة والمکونات الکیمائیة على أشجار البرتقال أبو سرة

“…This obtained result may be due to the response to light trend. These results are in agreement with those of Tawfeek and Abu-Shall, 2010;Chouih et al, 2011 andTaibi et al, 2016 .They reported that the average numbers of scales on the upper surface of leaf were more abundant than that on lower one. The occurrence percentages of P. ziziphus per leaf were 85.8% for the upper surface and 14.2% for the lower one.…”

The Black Parlatoria Scale, Parlatoria ziziphi (Lucas, 1853) (Hemiptera: Coccomorpha: Diaspididae): a guide to field identification

“…The Black Parlatoria Scale (BPS), Parlatoria ziziphi (Lucas, 1853) has often been a major threat to citrus crops ( Citrus spp. : Rutaceae) in various parts of the world and has an important economic impact on citrus fruit production (Talhouk, 1975; EPPO, 2015; García Morales et al ., 2016; Taibi et al ., 2016).…”