Tag Archives: Phthorimaea operculella

A comparison Between Artificial Medium and Potato Tubers for Potato Tuber Moth, Phthorimaea operculella (Zeller) Rearing Based on Life Table Parameters

Gassan Youssef*(1)

(1). General Organization of Seed production, Homs, Syria.

(*Corresponding author: Dr. Gassan Youssef. E-Mail:ghassanyoussef@hotmail.com).

Received: 21/03/2019                                Accepted: 07/09/2019

Abstract

Life table studies for potato tuber moth, Phthorimaea operculella (Zeller) were carried out to compare an artificial medium to potato tubers, Solanum tuberosum L. for rearing Ph. operculella larvae. The calculated biological parameters were: Net reproductive rate of increase (R0), Generation time (Gt), Intrinsic rate of increase (rm), Finite rate of increase (λ) and Population doubling time (Dt). The obtained results indicated that potato tubers proved to be more favorable for achieving the highest developmental and multiplication rates of Ph. operculella, than artificial diet. The natural mortality figures; Apparent Mortality (AM), Real Mortality (RM) and Indispensable Mortality (IM) for larvae reared on potato tubers were 46.77, 29 and 20.21%, respectively. Meanwhile, the highest mortality rates were 51.72, 30 and 19.29% when larvae were fed on artificial diet.  It is quite worth to mention out here that potato tubers are more attractive feeding source than artificial diet for rearing Ph. operculella for research purposes.

Keywords: Potato tuber moth, Phthorimaea operculella, Life table, Artificial diet.

Full Paper in English: PDF

Effect of Host-Plant on Life Table Parameters of Potato Tuber Moth Phthorimaea operculella (Zeller)

Gassan Youssef*(1)

(1). General Organization of Seed production, Homs, Syria.

(*Corresponding author: Dr. Gassan Youssef. E-Mail:ghassanyoussef@hotmail.com).

Received: 14/04/2018                                Accepted: 03/10/2018

Abstract

Life table studies for potato tuber moth, Phthorimaea operculella (Zeller) were carried out on three host plants namely; potato tubers, Solanum tuberosum L. (Potato), eggplant fruits, Solanum melongena L. (Aubergine) and green tomatoes, Solanum esculentum Mill (Tomato), to evaluate the preferred host plant for feeding Ph. operculella larvae. The calculated biological parameters were: Net reproductive rate of increase (R0), generation time (Gt), intrinsic rate of increase (rm), finite rate of increase (λ) and population doubling time (Dt). Obtained results indicated that potato tubers proved to be the quite favorable for achieving the highest developmental and multiplication rates of Ph. operculella, followed by eggplant meanwhile tomato was the least favorable. The natural mortality figures; Apparent Mortality (AM), Real Mortality (RM) and Indispensable Mortality (IM) for larvae reared on potato tubers were 20.73, 17.00 and 13.34%, respectively. Meanwhile, the highest mortality rates were 32.58, 29.00 and 18.36% when larvae were fed on eggplant fruits. It is quite worth to mention out here that potato tubers are considered as the most attractive for feeding and rearing Ph. operculella for research purposes followed by egg-plant. Tomato seem to be the least acceptable host plant.

Key words: Host plants, Life tables, Potato tuber moth, Phthorimaea operculella.

Full paper in English: PDF

Evaluation of Local Isolates of Beauveria bassiana (Ascomycota: Hypocreales) As control Agent for Potato Tuber Moth Phthorimaea operculella (Gelechiidae:Lepidoptera) Under Non-refrigerated Storage conditions

Nisreen Alsaoud*(1) Doummar Nammour(1) and Ali Yaseen Ali(2)

(1). Plant Protection Department,  Faculty of Agriculture, Albaath University, Homs, Syria,

(2). Tarsus Research Center, General Commission for Scientific Agricultural Research (GCSAR), Damascus, Syria.

(*Corresponding author: Eng. Nisreen Alsaoud. E. mail nisreensoud@gmail.com).

Received: 16/07/2017                                Accepted: 01/10/2017

Abstract

The efficacy of three native isolates of the entomopathogenic fungus Beauveria bassiana (Ascomycota: Hypocreales), with concentration of 1×107 spore/ml, were tested on potato tuber moth Phthorimaea operculella (Gelechiidae:Lepidoptera) under non-refrigerated storage conditions (28̊±2 C and R.H=50%± 5). The results showed the efficiency of the three isolates in the studied concentration to control the pest in store. These isolates showed superiority on control, where infection rates of tubers were 67, 83, 87.9, 100% for isolates C, D, B and control respectively, and reduced the severity of infection to 50.7, 63.2, 70.8, and 99.2% for isolates C, B, D and control respectively. The averages of emerged adults were 25, 15, 6.3, and 44.3 adults for isolates C, B, C and control respectively. Results showed that the fungus B. bassiana is an important control agent in integrated pest management for potato tuber moth in non-refrigerated stores.

Key words: Potato tuber moth, Beauveria bassiana, Phthorimaea operculella, Biological control.

Full paper in Arabic: PDF