scholarly journals Relationship Between Bemisia tabaci and Aphis gosspyii Infestations with Certain of Plant Diseases, Plant Enzyme Activities, Dissection Structures and Natural Enemies on Squash Plant.

2017 ◽  
Vol 9 (3) ◽  
pp. 87-98
Author(s):  
Gamal Hassan ◽  
Faragalla H. ◽  
Aziza Abou-Zaid ◽  
Abla Saad
Keyword(s):  
Bemisia Tabaci ◽  
Natural Enemies ◽  
Enzyme Activities ◽  
Plant Diseases ◽  
Plant Enzyme

Improvement on Natural Enemies of Bemisia tabaci (Hemiptera: Aleyrodidae) Using Extracts of Agrimonia pilosa

2019 ◽  
Vol 112 (4) ◽  
pp. 1581-1586
Author(s):  
Huifang Guo ◽  
Yufeng Qu
Keyword(s):  
Biological Control ◽  
Bemisia Tabaci ◽  
Natural Enemies ◽  
Insect Pests ◽  
Ethanol Extract ◽  
Pathogenic Fungi ◽  
Melia Azedarach ◽  
Encarsia Formosa ◽  
Ethanol Extracts ◽  
And Control

Abstract Compared with the numerous natural enemies against insect pests that have been identified, the commercialization of natural biological control resources remains very limited. To increase the use of natural enemies for biological control, determining how to improve the low efficacy, slow speed, and high cost of natural enemies is very important. Mediterranean species of The whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodoidea), increasingly threatens many crops in China, and control primarily depends on chemical insecticides. Here, the effect of ethanol extracts from two plants, Agrimonia pilosa (Ledeb) (Rosales: Rosaceae) and Melia azedarach (Linn) (Meliaceae: Melia), on predominant natural enemies of B. tabaci was investigated using a leaf dipping or spraying method. The results showed that the ethanol extract of A. pilosa significantly improved the infectivity of the fungus Isaria javanica (Friedrichs & Bally) (Ascomycota: Hypocreales), and the mortality of whiteflies caused by the combination of fungus (105 spores/mL) with the extract of A. pilosa (2 mg/mL dried powder of A. pilosa containing 0.0942 mg/mL total polyphenols) was 81.6%, which was significantly higher than that caused by the fungus only. However, the ethanol extract of M. azedarach had no effect on fungus infectivity. Additionally, insecticide tolerance of the predator Pardosa pseudoannulata was also significantly improved by the extract of A. pilosa. The longevity of the parasitoid Encarsia formosa was not affected by the extracts. These findings indicate that the extract of A. pilosa played a dual role that included improving pathogenic fungi infectivity and insecticidal tolerance of a predator and thus could be a synergist in the biological control of B. tabaci.

scholarly journals Can Generalist Predators Control Bemisia tabaci?

Insects ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 823
Author(s):  
Arash Kheirodin ◽  
Alvin M. Simmons ◽  
Jesusa C. Legaspi ◽  
Erin E. Grabarczyk ◽  
Michael D. Toews ◽  
...  
Keyword(s):  
Bemisia Tabaci ◽  
Natural Enemies ◽  
Cropping Systems ◽  
Review Literature ◽  
Generalist Predators ◽  
Generalist Predator ◽  
Predator Species ◽  
Molecular Gut Content Analysis ◽  
Biocontrol Potential ◽  
Substantial Control

The whitefly, Bemisia tabaci, has developed resistance to many insecticides, renewing interest in the biological control of this global pest. Generalist predators might contribute to whitefly suppression if they commonly occur in infested fields and generally complement rather than interfere with specialized natural enemies. Here, we review literature from the last 20 years, across US cropping systems, which considers the impacts of generalist predators on B. tabaci. Laboratory feeding trials and molecular gut content analysis suggest that at least 30 different generalist predator species willingly and/or regularly feed on these whiteflies. Nine of these predators appear to be particularly impactful, and a higher abundance of a few of these predator species has been shown to correlate with greater B. tabaci predation in the field. Predator species often occupy complementary feeding niches, which would be expected to strengthen biocontrol, although intraguild predation is also common and might be disruptive. Overall, our review suggests that a bio-diverse community of generalist predators commonly attacks B. tabaci, with the potential to exert substantial control in the field. The key challenge will be to develop reduced-spray plans so that generalist predators, and other more specialized natural enemies, are abundant enough that their biocontrol potential is realized.

scholarly journals Effects of buprofezin and imidacloprid on the functional response of Eretmocerus mundus Mercet

2014 ◽  
Vol 50 (No. 3) ◽  
pp. 145-150 ◽  
Author(s):  
F. Sohrabi ◽  
P. Shishehbor ◽  
M. Saber ◽  
M.S. Mosaddegh
Keyword(s):  
Functional Response ◽  
Bemisia Tabaci ◽  
Natural Enemies ◽  
Attack Rate ◽  
Sublethal Effects ◽  
Handling Time ◽  
Type Ii ◽  
Type Iii ◽  
Eretmocerus Mundus

Eretmocerus mundus Mercet is one of the key natural enemies of Bemisia tabaci (Gennadius). In this study, the sublethal effects of LC<sub>25</sub> of imidacloprid and field-recommended concentration of buprofezin on the functional response of E. mundus to different densities of second instar B. tabaci nymphs were evaluated. The results revealed a type III functional response in the control and imidacloprid treatment. The type III functional response was altered into a type II by buprofezin. Although imidacloprid did not alter the type of functional response of E. mundus compared to the control, it negatively affected the handling time and maximum attack rate of the parasitoid. Therefore, the use of this insecticide should be evaluated carefully in IPM programs.

scholarly journals EVALUATION OF SELECTED INSECTICIDES AGAINST WHITEFLY (Bemisia tabaci) ON BRINJAL CROPS AND THEIR EFFECT ON NATURAL ENEMIES

2017 ◽  
Vol 7 (4) ◽  
pp. 1151-1161 ◽  
Author(s):  
Mohd Rasdi Zaini
Keyword(s):  
Field Study ◽  
Bemisia Tabaci ◽  
Natural Enemies ◽  
Chemical Control ◽  
Post Treatment ◽  
Field Conditions ◽  
Pre Treatment ◽  
Treatment Observation ◽  
Control Water

A field study was carried out for two cropping periods in the first season in year 2014 and the second season in 2015. This study was carried out at share farm, Agrotechnology Plantation UiTM Melaka, Campus Jasin to examine the efficacy of selected insecticides against whitefly (Bemisia tabaci) on brinjal crops and the effect on natural enemies (Spider) under field conditions. Five treatments with four replications were applied. The treatments were T0= Control (water), T1= Imidacloprid (Confidor), T2= Acetamiprid (Mospilan), T3= Dinotefuran (Oshin) and T4= Cyantraniliprole (Benevia). Pre-treatment and post-treatment observation were recorded which is one day before application and 1, 3, 7 and 14 days after application of insecticides. A total of two applications of treatments were done. The results revealed that Imidacloprid was recorded as the most effective and the highest reduction of whiteflies during the first season with 96.73%, followed by Acetamiprid (92.44%), Cyantraniliprole (82.65%) and Dinotefuran (80.74%) while during the second season, Imidacloprid also was recorded as the highest reduction with 79.99%, followed by Acetamiprid (76.34%), Cyantraniliprole (54.09%) and Dinotefuran (36.87%). Overall, chemical control of Imidacloprid was the most effective against whiteflies populations in brinjal particularly in the first season as compared to second season. The effect of these selected insecticides on natural enemies (Spider) revealed that chemical control of Imidacloprid gave the highest reduction of spider with 65.69%), followed by Cyantraniliprole (64.47%), Acetamiprid (41.44%) and Dinotefuran (15.45%). Imidacloprid and Cyantraniliprole were classified as moderately harmful to spider while Acetamiprid and Dinotefuran were classified as harmless or slightly harmful.

Sign in / Sign up

Export Citation Format

Share Document