The role of natural enemies in regulating the population of the outbreak species Orgyia trigotephras (Lepidoptera: Erebidae) in North Africa

Ezzine, Olfa; Hammami, Sonia; Jamâa, Mohamed Lahbib Ben

doi:10.1007/s11829-022-09915-y

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…As shown in the analysis of our multi‐year data set, the O. trigotephras population density (i.e., egg batches per tree) varied with site and, after a general increase, gradually decreased in the forest stands throughout the monitoring period, being in accordance with the previously described cyclical fluctuations in population density of this pest (Ezzine et al., 2022). Thus, our results are based on the analysis of different population development phases, which reinforces the validity of our sampling plans.…”

Section: Discussionsupporting

confidence: 90%

“…Investigations were carried out in four stands of the Jebel Abderrahmane natural forest area in north-eastern Tunisia (Beni Oulid, Delhiza, Ftahiz, and Guitoun) from 2013 to 2019 (Figure 1; Table 1). Outbreaks of O. trigotephras had been observed in 2005 and 2009 in two (i.e., Beni Oulid and Delhiza) out of the four monitored sites (Ezzine et al, 2015(Ezzine et al, , 2022 (Table 1). The entire area is dominated by Q. coccifera and characterized by subhumid climate conditions, with an annual average temperature of 18.5°C, and average minimum and maximum annual temperatures of 11.1 and 27.4°C, respectively.…”

Section: Study Area and Data Collectionmentioning

confidence: 99%

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Sequential sampling plans for Orgyia trigotephras infesting Quercus coccifera forests in North Africa

Ezzine,

Mannu,

Hammami

et al. 2024

Entomologia Exp Applicata

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The tussock moth, Orgyia trigotephras Boisduval (Lepidoptera: Erebidae), is one of the main emerging pests of kermes oak, Quercus coccifera L. (Fagaceae), in the Mediterranean area, where it can cause the defoliation of several hectares of forests during its population outbreaks. Despite this, no specific sampling procedures to properly estimate the population density of this pest have been developed yet. The aims of this research were to develop and compare enumerative and binomial sequential sampling plans to estimate the population density of O. trigotephras in forest environments. Data were collected in four forest stands dominated by Q. coccifera in Tunisia for 7 years (from 2013 to 2019) to take into consideration the potential spatio‐temporal variability in pest density. Plant community composition was determined at the beginning of the experimental trials, and enumerative and binomial sampling plans were developed at precision levels of 0.15 and 0.25. Over the entire sampling period, the average O. trigotephras egg batch density differed significantly among sites. Sample sizes of enumerative sampling plans were approximately 39 and 109 trees to estimate an average density of 0.50 O. trigotephras egg batches per tree at the precision levels of 0.25 and 0.15, respectively. Instead, binomial sequential sampling plans required smaller sampling sizes than the enumerative sampling plan. Our findings represent the baseline to develop a program for monitoring O. trigotephras at a large spatial scale.

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Section: Discussionsupporting

confidence: 90%

Section: Study Area and Data Collectionmentioning

confidence: 99%