Tag Archives: Biological control.

Evaluation the Efficiency of the Predator Serangium parcesetosum Sicard (Coleoptera: Coccinellidae) in Controlling Bemisia tabaci Genn. (Homoptera: Aleyrodidae) on Cucumber and Tomato Plants

Rafik Abboud*(1) Majedah Mofleh(2) and Ahmad Mohammad(3)

(1). Latakia Agriculture Research Center, General Commission for Scientific Agricultural Research GCSAR, Damascus, Syria.

(2). Plant Protection Department, Faculty of Agriculture, Tishreen University, Latakia, Syria.

(*Corresponding author: Dr. Rafik Abboud. E-Mail: abboud.rafeek@hotmail.com).

Received: 17/07/2019                                Accepted: 08/12/2019

Abstract

The study was conducted to evaluate the efficacy of the predator Serangium parcesetosum Sicard (Coleoptera: Coccinellidae) in controlling Bemisia tabaci Genn. on tomato and cucumber plants in cages. The experiment included four treatments and 12 replications. The first and third treatments were conducted on cucumber plants and second and fourth treatments were experienced on tomato plants. Adults of B. tabaci were introduced in cages on plants that have six true leaves. Two weeks later, adults of S. parcesetosum were introduced in the first and second treatments at a rate of two adult predators/plant. The release was done three times at weekly intervals. The third and fourth treatments remained predator-free. Leaves were examined weekly, the population of immature stages were recorded (eggs, L1, L2, L3, L4\ 1 cm2 leaf) which were taken randomly from the top, middle and bottom of the plants. The predator was not recorded on tomato. The number of whitefly stages increased in treated cages until the sixth week, and then began to decrease from about 20 eggs and 39 nymphs/1 cm2 of leaf surface to 11 eggs and 3 nymphs after ten weeks. Population density of the whitefly in the control increased to 219 eggs and 145 nymphs/1 cm2 of leaf surface during the same period. Mortality rates of old nymphs were 93.3 and 4.1% after nine weeks for the predator treatment and control, respectively. Results indicated that, S. parcesetosum could be recommended for the control of B. tabaci on cucumber in protected cultivation in Syria.

Keywords: Biological control, Bemisia tabaci, Cucumber, Tomato, Protected cultivation, Syria.

Full Paper in Arabic: PDF

The Effect of Biological Control of Two Spotted Spider Mite Tetranychus urticae Koch by Using the Predatory Mite Phytoseiulus Persimilis Athias-Henroit on Growth and Productivity of Some Climbing Beans Cultivars

Riad Zidan(1) Mohammad Ahmad(2) and Alisar Shaabow*(1)

(1). Department of Horticulture, Faculty of Agriculture Tishreen University, Latakia, Syria.

(2). Department of Plant Protection, Faculty of Agriculture, Tishreen University, Latakia, Syria.

(*Corresponding author: Eng. Alisar Shaabow. E-Mail: alisar.nadeem@yahoo.com).

Received: 19/11/2018                                Accepted: 19/12/2018

Abstract

The study was carried out in a greenhouse at Latakia center for rearing natural enemies during 2017 and 2018, in order to study the effect of  the biological control of the two spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae) by using the predatory mite Phytoseiulus persimilis Athias-Henroit (Acari: Phytoseiidae) on growth and production of five cultivars of climbing bean i.e. Kentucky wonder white, Blue lake, Fatima, Purple Queen, and Zilioni Gigant. The results showed that releasing the predatory mite increased the leal area to 10294 cm2 compared with that in the prey treatment 5983 cm2, and the net assimilation rate increased from 0.15 to 0.36 mg/cm2/day, while the production increased from  0.27 kg/m2 to 1.25 kg/m2, for both prey and predator treatments respectively. The results also showed that Kentucky wonder white cultivar of the predator treatment exceeded other cultivars in leaf area 9499 cm2 and production 1.18 kg/m2.

Key words: Climbing bean, Growth traits, Biological control, Tetranychus urticae Koch، Phytoseiulus persimilis Athias-Henroit.

Full paper in Arabic: PDF

The Effect of Biological Control of Two Spotted Spider Mite Tetranychus urticae Koch by Using the Predatory Mite Phytoseiulus Persimilis Athias-Henroit on Growth and Productivity of Some Climbing Beans Cultivars

Riad Tofik Zidan(1) Mohammad Ahmad  Ahmad(2) and Alisar Nadim Shaabow*(1)

(1). Department of Horticulture, Faculty of Agriculture, Tishreen University, Latakia, Syria.

(2). Department of Plant Protection, Faculty of Agriculture, Tishreen University, latakia, Syria.

(*Corresponding author:  Eng. Alisar Shaabow. E-Mail: alisar.nadeem@yahoo.com).

Received: 19/11/2018                                Accepted: 19/12/2018

Abstract

The study was carried out at a greenhouse in latakia center for rearing natural enemies during 2017 and 2018, in order to study the effect of  the biological control of the two spotted spider mites Tetranychus urticae Koch (Acari: Tetranychidae)  by using the predatory mite Phytoseiulus persimilis Athias-Henroit (Acari: Phytoseiidae) on growth and productivity of five cultivars of climbing beans: Kentucky wonder white, Blue lake, Fatima, Purple Queen, and Zilioni Gigant. The results showed that releasing the predatory mite increased leaf area to 10294 cm2 compared with the prey treatment 5983 cm2, the net assimilation rate increased from 0.15 to 0.36 mg/cm2/day, and the productivity increased from 0.27 kg/m2 to 1.25 kg/m2, for both prey and predator treatments respectively. The results also showed that Kentucky Wonder White cultivar had the highest leaf area (9499 cm2) and productivity (1.18 kg/m2) with the existence of the predator.

Key words: Climbing bean, growth, Biological control, Tetranychus urticae Koc, Phytoseiulus persimilis Athias-Henroit.

Full Paper in Arabic: 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

Evaluation the Impact of Both Predator Serangium parcesetosum Sicard and Chilocorus bipustulatus L. (Coleoptera: Coccinellidae) in Controlling Citricola Scale Insect Coccus pseudomagnoliarum (Kuwana) and Olive Scale Saissetia oleae (Olivier) (Hemiptera:Coccidae) on Citrus, Syria

Shadi Deeb(1) Rafik Abboud*(1) Majeda Mofleh(1) and Muhammed Ahmad(2)

(1). Latakia Agriculture Center, General Commission for Scientific Agricultural Research (GCSAR), Damascus, Syria.

(2). Plant Protection Department, Faculty of Agriculture, Tishreen University, Latakia, Syria.

(*Corresponding author: Dr. Rafik Abboud. E-Mail: abboud.rafeek@hotmail.com).

Received: 30/07/2017                                 Accepted: 10/11/2017

Abstract

The citricola scale Coccus pseudomagnoliarum (Kuwana) and the olive scale insect Saissetia oleae (Olivier) (Hemiptera: Coccidae) are considered economically important pests on citrus in the Syrian coast. This study was carried out at Ciano Research Station, Latakia Research Center/Syria, to evaluate the efficiency of the predators Serangium parcesetosum (Sicard), and Cilocorus bipustulatus L. (Coleoptera: Coccinellidae) to control both of pests within the cages. The study included six treatments, with three replicates per treatment. Citrus grasses isolated individually within cages, and infested in the first, second and third treatment by adults of citricola scale, and in the fourth, fifth and sixth treatments by adults of olive scale. The adults of S. parcesetosum were released after 30 days of the infection, in the first and fourth treatments, while the adults of C. bipustulatus were released in the second and fifth treatments at a rate of 2 adults/grass per a week, but the third and sixth treatments adopted as a control for comparison. The results showed the ability of the predators feeding on nymphs first age for each of the pests, and they were able to reduce the intensity of citricola scale nymphs by 97.8 and 99.2% in both predators C. bipustulatus and S. parcesetosum two weeks after the release, respectively, while the rate of decline in the control was 29.2% during the same period. Black scale nymph’s density also decreased by 99.9 and 99.4% in the treatments of predators C. bipustulatus and S. parcesetosum after three weeks of the launch, respectively. The results of this study showed the ability of each of predators C. bipustulatus and S. parcesetosum in control citricola scale and olive scale on citrus.

Key words: Biological control, Citricola scale, Coccus pseudomagnoliarum, Olive scale, Saissetia oleae, Serangium parcesetosum, Cilocorus bipustulatus.

Full paper in Arabic: PDF

Preliminary Study of Parasitoid Bracon sp. (Hymenoptera: Braconidae) on The Leafminer Tuta absoluta (Lepidoptera: Gelechiidae) and Plodia interpunctella H. (Lepidoptera: Pyralidae)

Rafeek Ali Abboud(1) Magda Mofleh(1) Hanan Habak(1) and Mohamad Ahmad Ahmad(2)

(1). Lattakia Research Center, General Commission for Agricultural Scientific Research (GCSAR), Damascus, Syria.
(2). Department of Plant Protection, Faculty of Agriculture, Tishreen University, Lattakia, Syria.

(*Corresponding author: Dr. Magda Mofleh, Lattakia Research Center, (GCSAR), Damascus, Syria. E-Mail: magda.mofleh @yahoo.com).

Received: 19/08/ 2014                                     Accepted: 19/05/ 2015

Abstract:

In this study, the reproductive performance of the parasitoid Bracon sp. (Hymenoptera: Braconidae) against the leafminer T. absoluta and Plodia interpunctella H. (Lepidoptera: Pyralidae) as alternate host was studied in the laboratory at Lattakia Agriculture Research Center, Lattakia, Syria, during  2011 and 2012 seasons. Parasitoid’s life tables were organized, and 5 full grown host larvae were presented to the parasitoid daily. Means development period (egg, larvae, and pupa) (X ± SD) for female parasitoids Bracon sp. were 7.86 ± 0.93 and 8.70 ± 0.73 days against P. interpunctella and T. absoluta, respectively. Values of intrinsic rate of increase (rm) were 0.132 and 0.186 on T. absoluta and P. interpunctella, respectively. Also the values of net reproductive rate (R0), Gross reproductive rate (GRR), and the finite rate of increase (λ) were higher on P. interpunctella than T. absoluta, but the generation period time (T) and the doubling time of population (DT) were shorter on P. interpunctella as compared with T. absoluta. This study clarified the capability of breeding the parasitoids Bracon sp.  at the lab against P. interpunctella to control T. absoluta in tomato fields.

Key words: Tuta absoluta, Plodia interpunctella, Bracon sp., Biological control.

Full paper in Arabic: دراسة أولية لحياتية الطفيل
Bracon sp. (Hymenoptera: Braconidae) على عثة أوراق البندورة الأمريكية وعثة الطحين الهندية