scholarly journals Functional Responses of Coccinella undecimpunctata and Chrysoperla carnea to their Aphid Prey under Semi-Field Conditions

2020 ◽  
Vol 11 (2) ◽  
pp. 89-95
Author(s):  
Rehab Khalil ◽  
F. Shaheen ◽  
A. Abdel-Hady ◽  
A. Saleh
Keyword(s):  
Field Conditions ◽  
Chrysoperla Carnea ◽  
Functional Responses ◽  
Coccinella Undecimpunctata ◽  
Aphid Prey

scholarly journals Differential Efficacies of Nomuraea Rileyi and Isaria Fumosorosea on Some Serious Pests and the Pests’ Efficient Predator Prevailing in Tomato Fields in Egypt

2013 ◽  
Vol 53 (2) ◽  
pp. 103-109 ◽  
Author(s):  
Mamdouh Maher Matter ◽  
Magda Mahmoud Sabbour
Keyword(s):  
Bemisia Tabaci ◽  
Myzus Persicae ◽  
Microbial Control ◽  
Field Conditions ◽  
Lethal Concentration ◽  
Nomuraea Rileyi ◽  
Isaria Fumosorosea ◽  
Tomato Yield ◽  
Coccinella Undecimpunctata ◽  
Efficient Predator

Abstract The efficiency of the two microbial control agents Nomuraea rileyi and Isaria fumosorosea, were evaluated against Bemisia tabaci and Myzus persicae pests in tomato cultivations The safety levels of the agents, to the predator Coccinella undecimpunctata, were also studied under laboratory and field conditions. Results showed that under laboratory conditions, LC50 values for N. rileyi and I. fumosorosea were 103.7x104 and 139.4x104 spores/ml against B. tabaci, respectively, while the corresponding values for M. persicae were 89.1x104 and 149.8x104 spores/ml, respectively. Under the field conditions, the percentages of infested plants with B. tabaci and M. persicae were significantly decreased after treatments with both fungi as compared with the corresponding controls. At the El-Esraa farm (Nobaria region), the weights of the tomato yield were 2,417 and 2,911 kg/feddan when I. fumosorosea and N. rileyi were applied respectively, as compared with 2,010 kg/feddan in the corresponding controls. The corresponding yields in El-Kassaseen were 2,699 and 2,999 kg/feddan, respectively, as compared to 1,990 kg/feddan in the control. The present study showed that C. undecimpunctata exhibit relatively high and reasonable resistance to N. rileyi and I. fumosorosea at the highest lethal concentration (1x108 spores/ml) for both tested preys.

scholarly journals The functional response of, Chrysoperla carnea (Stephens) larvae on different nymphal instars of Dubas bug Ommatissus lybicus De Berg.

2014 ◽  
Vol 8 (2) ◽  
pp. 80-85
Author(s):  
Bassim. Sh. Hamad ◽  
Ryadh A. Okaily ◽  
George S. B. Yousif ◽  
Ahmed M. Abdullatif ◽  
Hussain F. Alrubeai
Keyword(s):  
Functional Response ◽  
Attack Rate ◽  
Larval Instar ◽  
Handling Time ◽  
Chrysoperla Carnea ◽  
Type Ii ◽  
Nymphal Instar ◽  
Functional Responses ◽  
Larval Instars ◽  
The Third

The functional response of second and third larval instars of Chrysoperla carnea (Stephens), against different nymphal instars of Dubas bug Ommatissus lybicus De Berg. was studied.The larval instars of the predator exhibited Type II functional responses against the prey. Based on disk equation the attack rate (a) of the second larval instars of the predator were estimated to 1.03± 0.043 , 0.94± 0.015 , 0.88± 0.009 and 0.77 ± 0.02 and the handling time (Th) were 0.0031, 0.0039, 0.0083, and 0.008 day for second, third, fourth and fifth nymphal instars respectively. The third instars larvae of the predator, the attack rate against these nymphal instars were 1.11± 0.01, 1.04 ± 0.29 , 0.97± 0.017 and 0.89 with handling time 0.0019, 0.0028, 0.0064, and 0.0067 day respectively. The theoretical maximum predation(T/Th) of the second larval instars were 322, 256, 120 and114 nymphs for second, third, fourth and fifth nymphal instar respectively; while they were 526, 357, 156, and 149 for the third larval instar. According to this study this predator have a good predation potential in preying on nymph of Dubas bug especially the small nymphs (second and third ).

scholarly journals Testing of Chrysoperla carnea (S) against Bimisia tabaci in Bt. cotton crop under field conditions

2020 ◽  
Vol 1 (2) ◽  
pp. 60-64
Author(s):  
Abdul Samad Soomro ◽  
Shabana Naz Mazari ◽  
Abdul Sattar Soomro
Keyword(s):  
Field Conditions ◽  
Chrysoperla Carnea ◽  
Bt Cotton ◽  
Cotton Crop

scholarly journals EFFICIENCY OF SECOND INSTAR LARVAE OF CHRYSOPERLA CARNEA TO SUPPRESS SOME PIERCING SUCKING INSECTS INFESTING CANTALOUPE UNDER SEMI- FIELD CONDITIONS

2013 ◽  
Vol 91 (1) ◽  
pp. 169-179
Author(s):  
MOHAMEDW. YOUNES ◽  
I.BRAHIM F. SHOUKRY ◽  
SAMIA A. METWALLY ◽  
YOMNA N. ABD-ALLAH
Keyword(s):  
Field Conditions ◽  
Chrysoperla Carnea

scholarly journals Considerations When Applying the Consumer Functional Response Measured Under Artificial Conditions

2021 ◽  
Vol 9 ◽  
Author(s):  
Blaine D. Griffen
Keyword(s):  
Functional Response ◽  
Response Curve ◽  
Mathematical Formulation ◽  
Field Conditions ◽  
Functional Responses ◽  
Considerable Effort ◽  
Natural Conditions ◽  
Ecological Processes ◽  
Foraging Patterns ◽  
Foraging Decisions

Since its creation, considerable effort has been given to improving the utility of the consumer functional response. To date, the majority of efforts have focused on improving mathematical formulation in order to include additional ecological processes and constraints, or have focused on improving the statistical analysis of the functional response to enhance rigor and to more accurately match experimental designs used to measure the functional response. In contrast, relatively little attention has been given to improving the interpretation of functional response empirical results, or to clarifying the implementation and extrapolation of empirical measurements to more realistic field conditions. In this paper I explore three concepts related to the interpretation and extrapolation of empirically measured functional responses. First, I highlight the need for a mechanistic understanding when interpreting foraging patterns and highlight pitfalls that can occur when we lack understanding between the shape of the functional response curve and the mechanisms that give rise to that shape. Second, I discuss differences between experimental and real-world field conditions that must be considered when trying to extrapolate measured functional responses to more natural conditions. Third, I examine the importance of the time scale of empirical measurements, and the need to consider tradeoffs that alter or limit foraging decisions under natural conditions. Clearly accounting for these three conceptual areas when measuring functional responses and when interpreting and attempting to extrapolate empirically measured functional responses will lead to more accurate estimates of consumer impacts under natural field conditions, and will improve the utility of the functional response as a heuristic tool in ecology.

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