scholarly journals Feeding Potential of Chyroperla carnea on Myzus persicae (Sulzer) under Laboratory Conditions

2019 ◽  
Vol 5 (2) ◽  
Author(s):  
Muhammad Farhan ◽  
Ghulam Murtaza ◽  
Muhammad Ramzan ◽  
Muhammad Waqar Sabir ◽  
Muhammad Arsalan Rafique ◽  
...  
Keyword(s):  
Myzus Persicae ◽  
Laboratory Conditions ◽  
Feeding Potential

scholarly journals Effect of aqueous extracts of three different plants on Myzus persicae Sulzer (Hemiptera: Aphididae) infesting pepper plants under laboratory conditions

2021 ◽  
Vol 11 (2) ◽  
pp. 101-106
Author(s):  
Lassaad Mdellel ◽  
Ahmed Abdelli ◽  
Khaled Omar ◽  
Waleed El-Bassam ◽  
Mazen Al-Khateeb
Keyword(s):  
Myzus Persicae ◽  
Management Strategy ◽  
Green Peach Aphid ◽  
Aqueous Extracts ◽  
Relative Growth ◽  
Insecticidal Effect ◽  
Laboratory Conditions ◽  
Mean Relative Growth Rate ◽  
Pot Marigold ◽  
Pepper Plants

This study aimed to determine the percentage infestation and population parameters of the green peach aphid Myzus persicae under laboratory conditions and evaluate the effect of aqueous extracts of three different plants (pot marigold: Calendula officinalis, mint: Mentha viridis and rosemary: Salvia rosmarinus) on the mortality of this aphid. Extracts of these plants were used at three concentrations (C1 = 15%, C2 = 30% and C2 = 45%). Results indicate a percentage infestation of 76.9 ± 9.4%, a mean relative growth rate of 0.062 ± 0.007 and generation time of 11.12 ± 1.42 days. All treatments reduced the numbers of aphids and statistically significantly reduced the number (α < 0.01) recorded after treatment with C1, C2 and C3 of each extract. C. officinalis extract was more effective than those of M. viridis and S. rosmarinus. The highest mortality (69.82 ± 5.23%) and efficacy (61.71 ± 4.46%) were recorded for the C3 of aqueous extract of C. officinalis, whereas the lowest mortality (38.24 ± 2.42%) and efficacy (32.41 ± 1.23%) were recorded for the C1 of extract of M. viridis. The data provided indicate that aqueous extracts of C. officinalis, M. viridis and S. rosmarinus have an insecticidal effect on M. persicae and can be integrated into a pest management strategy to reduce M. persicae abundance on pepper plants.

Bt-toxin uptake by the non-target herbivore,Myzus persicae(Hemiptera: Aphididae), feeding on transgenic oilseed rape in laboratory conditions

2010 ◽  
Vol 101 (2) ◽  
pp. 241-247 ◽  
Author(s):  
G. Burgio ◽  
G. Dinelli ◽  
I. Marotti ◽  
M. Zurla ◽  
S. Bosi ◽  
...  
Keyword(s):  
Oilseed Rape ◽  
Myzus Persicae ◽  
Previous Experiment ◽  
Toxin Concentration ◽  
Bt Toxin ◽  
Laboratory Conditions ◽  
Cry1ac Toxin ◽  
Transgenic Oilseed Rape ◽  
Toxin Uptake ◽  
Mean Concentration

AbstractThe potential non-target effects of genetically modified crops are some of the more debated topics within applied biotechnologies in agriculture and environmental risk assessment. The objective of the present research was to study the potential Bt-toxin uptake by the non-target herbivoreMyzus persicaeSulzer (Hemiptera: Aphididae) feeding on transgenic oilseed rape plants (Brassica napuscv. ‘Westar’ lines GT 2–4) expressing the Cry1Ac endotoxin. A specific aim was to replicate our previous experiment in controlled laboratory conditions to avoid or minimize the risk of contamination leading to potential false positive results. The toxin levels in vernalized (V) and not-vernalized (not-V) transgenic oilseed rape plants was also monitored to better clarify the role of physiological processes on Bt-toxin expression. Cry1Ac expression in not-V plants (mean concentration±SE=167.8±5.7 μg kg−1FW) showed a pattern of large variability, in comparison with V plants whose expression (mean concentration±SE=227.7±1.9 μg kg−1FW) was significantly more stable. Cry1Ac toxin was detected in three aphid samples reared on V plants with a mean toxin concentration±SE of 4.8±0.6 μg Kg−1FW and in three out of six samples of aphids reared on not-V plants (mean toxin concentration±SE=7.1±1.2 μg kg−1FW). The mean Bt-toxin concentration of all the positive aphid samples was 5.9±1.0 μg kg−1FW. Our results confirmed the findings of our previous experiment and highlighted the potential for Cry1Ac toxin uptake by aphids feeding on transgenic oilseed rape plants.

scholarly journals Feeding Potential of Fruit Fly (Diptera: Tephritidae) on Different Artificial Diets under Laboratory Conditions

2019 ◽  
Vol 3 (11) ◽  
pp. 109-113
Author(s):  
Iqra Aslam ◽  
Muhammad Ahsan Khan ◽  
Taskeen Ahmad ◽  
Tayybah Gul ◽  
Namrah Nazeer ◽  
...  
Keyword(s):  
Fruit Fly ◽  
Artificial Diets ◽  
Laboratory Conditions ◽  
Feeding Potential

Human drug taking under controlled laboratory conditions.

1988 ◽  
Author(s):  
Marian W. Fischman ◽  
Richard W. Foltin ◽  
Joseph V. Brady
Keyword(s):  
Laboratory Conditions

Multiple recycling of paperboard: Paperboard characteristics and maximum number of recycling cycles— Part I: Multiple recycling of corrugated base paper

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 631-638
Author(s):  
FREDERIC KREPLIN ◽  
HANS-JOACHIM PUTZ ◽  
SAMUEL SCHABEL
Keyword(s):  
Compression Test ◽  
Production Capacity ◽  
Strength Properties ◽  
Paper Properties ◽  
Corrugated Board ◽  
Laboratory Conditions ◽  
Base Paper ◽  
Study Results ◽  
Short Span ◽  
Multiple Recycling

Paper for recycling is an important fiber source for the production of corrugated base paper. The change in production capacity toward more and more packaging papers affects the composition of paper for recycling and influences the paper quality. This research project investigated the influence of the multiple recycling of five different corrugated base papers (kraftliner, neutral sulfite semichemical [NSSC] fluting, corrugating medium, testliner 2, and testliner 3) on suspension and strength properties under laboratory conditions. The corrugated board base papers were repulped in a low consistency pulper and processed into Rapid-Köthen laboratory sheets. The sheets were then recycled up to 15 times in the same process. In each cycle, the suspension and the paper properties were recorded. In particular, the focus was on corrugated board-specific parameters, such as short-span compression test, ring crush test, corrugating medium test, and burst. The study results indicate how multiple recycling under laboratory conditions affects fiber and paper properties.

Mechanoactivation Of Rice Husk Ash In Laboratory Conditions

2019 ◽  
pp. 20-26
Keyword(s):  
Mechanical Activation ◽  
Rice Husk ◽  
Amorphous Silica ◽  
Silicon Oxide ◽  
Rice Husk Ash ◽  
Pozzolanic Activity ◽  
Maximum Solubility ◽  
Laboratory Conditions ◽  
Before And After ◽  
Mineral Additive

In many rice producing countries of the world, including in Vietnam, various research aimed at using rice husk ash (RHA) as a finely dispersed active mineral additive in cements, concrete and mortars are being conducted. The effect of the duration of the mechanoactivation of the RHA, produced under laboratory conditions in Vietnam, on its pozzolanic activity were investigated in this study. The composition of ash was investigated by laser granulometry and the values of indicators characterizing the dispersion of its particles before and after mechanical activation were established. The content of soluble amorphous silicon oxide in rice husk ash samples was determined by photocolorimetric analysis. The pizzolanic activity of the RHA, fly ash and the silica fume was also compared according to the method of absorption of the solution of the active mineral additive. It is established that the duration of the mechanical activation of rice husk ash by grinding in a vibratory mill is optimal for increasing its pozzolanic activity, since it simultaneously results in the production of the most dispersed ash particles with the highest specific surface area and maximum solubility of the amorphous silica contained in it. Longer grinding does not lead to further reduction in the size of ash particles, which can be explained by their aggregation, and also reduces the solubility of amorphous silica in an aqueous alkaline medium.

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