Toxicity of some pesticides to Eretmocerus debachi (Hymenoptera: Aphelinidae), an important parasitoid of Parabemisia myricae (Homoptera: Aleyrodidae)

1994 ◽  
Vol 84 (1) ◽  
pp. 119-122 ◽  
Author(s):  
Nedim Uygun ◽  
Cetin Sengonca ◽  
Mehmet R. Ulusoy ◽  
Ulrich Kersting
Keyword(s):  
Adult Parasitoid ◽  
Citrus Orchards ◽  
Parabemisia Myricae

AbstractThe effects of nine pesticides commonly used in citrus orchards were tested on adults, larvae and pupae of the parasitoid Eretmocerus debachi Rose & Rosen in the laboratory. All pesticides caused immediate mortality to adult parasitoid females and significant losses in efficiency, if applied to larvae of E. debachi in its host Parabemisia myricae (Kuwana). Only the fungicide captan and the insecticide Mercathion (malathion) were slightly harmful and harmless to the parasitoid larva. Gramoxone (paraquat), Dursban 4 (chlopyrifos-ethyl), Mercathion and Supracide (methidathion) were harmful to E. debachi pupae, while five other pesticides were only moderately harmful or harmless.

scholarly journals The Whitefly Dialeurodes citri: A New Pest on Citrus in Tunisia?

2021 ◽  
Vol 16 (1) ◽  
pp. 11-18
Author(s):  
Synda Boulahia-Kheder ◽  
Keyword(s):  
Common Species ◽  
Biological Traits ◽  
Severe Damage ◽  
Control Programs ◽  
North East ◽  
Dialeurodes Citri ◽  
Citrus Orchards ◽  
Parabemisia Myricae ◽  
Very High ◽  
New Pest

Whiteflies invaded citrus orchards in Tunisia in the 90’s. Two species: Aleurothixus floccosus and Parabemisia myricae have been recorded successively infesting citrus and causing severe damage in Cap-Bon (North-East of Tunisia). These pests were first controlled by several insecticidal applications but with a relative efficiency. Then two biological control programs have been deployed completing the action of native natural enemies especially for P. myricae. The result was a very satisfactory control of both whitefly species, to a point that they almost disappeared from orchards for about 30 years. In 2017, a third whitefly species, identified as Dialeurodes citri, was observed during a prospection in citrus orchards in Takelsa region (Cap-Bon). It was a common species in Algeria, but never caused damage in Tunisia. In 2020, D. citri was found again with very high population densities in the regions of Menzel Bou Zelfa (Cap-Bon) and Tunis. These observations confirmed its change of status and spread in Tunisia. The main morphological and biological traits to distinguish between D. citri and the other two whitefly species, already recorded in Tunisia, were described and first observations on its infestation were reported. Some recommendations to manage this new pest are given.

scholarly journals Diversity of pathogenic Pseudomonas isolated from citrus in Tunisia

AMB Express ◽  
2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Maroua Oueslati ◽  
Magdalena Mulet ◽  
Mohamed Zouaoui ◽  
Charlotte Chandeysson ◽  
Jorge Lalucat ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Pseudomonas Syringae ◽  
Ice Nucleation ◽  
Phylogenetic Study ◽  
Future Studies ◽  
Citrus Orchards ◽  
First Time ◽  
New Cultivars

Abstract The damages observed in Tunisian citrus orchards have prompted studies on the Pseudomonas spp. responsible for blast and black pit. Prospective orchards between 2015 and 2017 showed that the diseases rapidly spread geographically and to new cultivars. A screening of Pseudomonas spp. isolated from symptomatic trees revealed their wide diversity according to phylogenetic analysis of their housekeeping rpoD and cts genes. The majority of strains were affiliated to Pseudomonas syringae pv. syringae (Phylogroup PG02b), previously described in Tunisia. However, they exhibited various BOX-PCR fingerprints and were not clonal. This work demonstrated, for the first time in Tunisia, the involvement of Pseudomonas cerasi (PG02a) and Pseudomonas congelans (PG02c). The latter did not show significant pathogenicity on citrus, but was pathogenic on cantaloupe and active for ice nucleation that could play a role in the disease. A comparative phylogenetic study of citrus pathogens from Iran, Montenegro and Tunisia revealed that P. syringae (PG02b) strains are closely related but again not clonal. Interestingly P. cerasi (PG02a) was isolated in two countries and seems to outspread. However, its role in the diseases is not fully understood and it should be monitored in future studies. The diversity of pathogenic Pseudomonas spp. and the extension of the diseases highlight that they have become complex and synergistic. It opens questions about which factors favor diseases and how to fight against them efficiently and with sustainable means.

First report of citrus tristeza virus in commercial citrus orchards in Tunisia

2021 ◽  
Author(s):  
Asma Najar ◽  
Imen Hamdi ◽  
Souad Mahmoud ◽  
Lassaad Medhioub ◽  
Imed Jaouadi ◽  
...  
Keyword(s):  
Citrus Tristeza Virus ◽  
First Report ◽  
Citrus Orchards ◽  
Tristeza Virus ◽  
Citrus Tristeza

Factors associated with Diaphorina citri immigration into commercial citrus orchards in São Paulo State, Brazil

2020 ◽  
Author(s):  
Fernando P. F. Zorzenon ◽  
Arthur F. Tomaseto ◽  
Matthew P. Daugherty ◽  
João R. S. Lopes ◽  
Marcelo P. Miranda
Keyword(s):  
Sao Paulo ◽  
São Paulo ◽  
Diaphorina Citri ◽  
Factors Associated ◽  
Paulo State ◽  
São Paulo State ◽  
Citrus Orchards

Visible-near infrared spectroscopy for detection of Huanglongbing in citrus orchards

2011 ◽  
Vol 77 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Sindhuja Sankaran ◽  
Ashish Mishra ◽  
Joe Mari Maja ◽  
Reza Ehsani
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Citrus Orchards

Evaporation and canopy conductance of citrus orchards

2009 ◽  
Vol 96 (4) ◽  
pp. 565-573 ◽  
Author(s):  
F.J. Villalobos ◽  
L. Testi ◽  
M.F. Moreno-Perez
Keyword(s):  
Canopy Conductance ◽  
Citrus Orchards

Parabemisia myricae. [Distribution map].

1992 ◽  
Author(s):  
Keyword(s):  
Hong Kong ◽  
North America ◽  
Geographical Distribution ◽  
Ivory Coast ◽  
Morus Alba ◽  
Cinnamomum Camphora ◽  
Distribution Map ◽  
Parabemisia Myricae ◽  
New Distribution ◽  
Distribution In Europe

Abstract A new distribution map is provided for Parabemisia myricae (Kuwana) Homoptera: Aleyrodidae (Japanese bayberry whitefly). Attacks mulberry, Citrus, avocado, Gardenia, Cinnamomum camphora, Prunus, Salix, Morus alba and tea. Information is given on the geographical distribution in Europe, Crete, Cyprus, Greece, Italy, Sicily, Spain, Turkey, Africa, Egypt, Tunisia, Ivory Coast, Asia, Hong Kong, Israel, Japan, Malaysia, Taiwan, North America, USA, California, Florida.

Sign in / Sign up

Export Citation Format

Share Document