scholarly journals Preference and performance of the gypsy moth cater­pillars on sweet chestnut and some oak species

2010 ◽  
pp. 113-124 ◽  
Author(s):  
Slobodan Milanovic
Keyword(s):  
Gypsy Moth ◽  
Sweet Chestnut ◽  
Sessile Oak ◽  
Preference Index ◽  
Mixed Plantations ◽  
Study Results ◽  
Turkey Oak ◽  
And Performance ◽  
Common Oak ◽  
Oak Leaves

In the establishment of mixed plantations, it is necessary to examine previously the relations of the principal and the admixed species and the most significant pests. This paper presents the results of the study of the gypsy moth caterpillar preference and performance on sweet chestnut and four oak species. Preference index is the highest for Hungarian oak (0.83) and Turkey oak (0.77), for sessile oak it is significantly lower (0.33), and for common oak it is equal to 0. In combination with sweet chestnut, the gypsy moth second-instar caterpillars prefer Hungarian oak, i.e. Turkey oak leaves. In combination with sessile oak or common oak, the gypsy moth caterpillars prefer sweet chestnut leaves. The analyzed parameters which characterise the performance of the gypsy moth fourth-instar caterpillars are lower for all study oak species compared to sweet chestnut, except in the case of Turkey oak. Based on the study results and the adopted principle that the mixture should be composed of the most favourable species, which will serve as the 'trap plant' during the gypsy moth outbreak, it can be concluded that Turkey oak is more favourable for the mixture with sweet chestnut than the other analyzed oak species.

scholarly journals Host plant effect on the number of moultings and head capsule width of the gypsy moth caterpillars

2012 ◽  
pp. 127-138
Author(s):  
Slobodan Milanovic ◽  
Sladjan Milanovic
Keyword(s):  
Gypsy Moth ◽  
Head Capsule ◽  
Larval Instars ◽  
Head Capsule Width ◽  
Sessile Oak ◽  
Turkey Oak ◽  
English Oak ◽  
Host Plant Effect ◽  
Oak Leaves

The effect of four oak species: Turkey oak, Hungarian oak, sessile oak and English oak on the number of moultings and head capsule width of the gypsy moth caterpillars was researched. Host plants have a statistically significant effect on the number of both male and female larval instars. The highest number of larval instars was recorded for caterpillars fed on sessile oak leaves, and the lowest number was recorded for those fed on Turkey oak leaves. Females reared on Hungarian oak and English oak leaves had a normal number of larval instars. Except for 1st instar caterpillars, all other larval instars showed a statistically significant host plant effect on the head capsule width. The widest head capsules were found on caterpillars fed on Turkey oak leaves, and those fed on sessile oak leaves had the narrowest head capsules. The study data on head capsule widths can be practically applied in the determination of the optimal ratio of larval instars in the gypsy moth population, i.e. in the determination of terms for aerial spraying actions.

scholarly journals Host plant effect on the susceptibility of gypsy moth caterpillars to insecticides

2002 ◽  
pp. 69-78
Author(s):  
Slobodan Milanovic
Keyword(s):  
Host Plant ◽  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Abiotic Factors ◽  
Pedunculate Oak ◽  
Moth Population ◽  
Study Results ◽  
Turkey Oak ◽  
Host Plant Effect ◽  
Oak Leaves

Gypsy moth (Lymantria dispar L) is the most significant pest of broadleaf forests. The dynamics of gypsy moth population depends on several biotic and abiotic factors, but it is also highly dependent on the quality of consumed food. The gypsy moth control increasingly relies on the biological preparations based on Bacillus thuringiensis subspec. kurstaki (Btk) and Lymantria dispar Nuclear Poliedrosis virus (NPV). Chemical preparations are still applied although more rarely, the pyrethroids which include also lambda-cyhalothrin This paper presents the study results of the effect of host plant on gypsy moth caterpillar (Lymantria dispar L) susceptibility to lambda cihalotrine insecticide, by which the study oak leaves were contaminated. The study results show the lowest mortality of the caterpillars fed on contaminated leaves of Turkey oak (17.5%), then pedunculate oak (86.1%), and the highest mortality of caterpillars fed on sessile oak leaves (92%). The rate of the gypsy moth caterpillar development depends on the host plant Susceptibility of the gypsy moth caterpillars to the above preparation depends on the host plant The knowledge of the effect of host plant on insecticide efficiency in gypsy moth suppression would render insecticide utilisation optimal.

scholarly journals Effects of pedunculate oak tree vitality on gypsy moth preference and performance

2014 ◽  
Vol 66 (4) ◽  
pp. 1659-1672 ◽  
Author(s):  
Slobodan Milanovic ◽  
Ljubodrag Mihajlovic ◽  
Dragan Karadzic ◽  
Libor Jankovsky ◽  
Predrag Aleksic ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Gypsy Moth ◽  
Food Utilization ◽  
Pedunculate Oak ◽  
Tree Vitality ◽  
Positive Effects ◽  
Gypsy Moths ◽  
Negative Effect ◽  
And Performance ◽  
Oak Leaves

Gypsy moths and powdery mildew play a significant role in oak decline processes. However, information is lacking on the effects on the gypsy moth of impaired tree vitality caused by defoliation or parasite infection. We assessed how pedunculate oak leaves collected from vigorous, declining, and infected trees influenced gypsy moth preference and performance (growth and nutritional indices). We found a negative effect of powdery mildew-infected leaves on gypsy moth performance, while declining trees had positive effects on gypsy moth performance and preference. All examined parameters of larvae fed declining oak leaves were higher than those of larvae fed vigorous oak leaves. Increased growth on declining oak leaves was caused by both higher consumption and more efficient food utilization. The results of this research could help us to better understand multitrophic interactions in complex communities such as oak forests.

scholarly journals Effect of host plant on gypsy moth diet and biological efficacy of Btk preparations

2006 ◽  
pp. 197-210 ◽  
Author(s):  
Slobodan Milanovic ◽  
Mara Tabakovic-Tosic ◽  
Nenad Markovic
Keyword(s):  
Host Plant ◽  
Gypsy Moth ◽  
Tree Species ◽  
Host Plants ◽  
The Third ◽  
Biological Preparation ◽  
Turkey Oak ◽  
Quercus Cerris ◽  
Bacterium Bacillus ◽  
Oak Leaves

The effect of two host plants, Turkey oak (Quercus cerris L) and black poplar (Populus nigra L) on gypsy moth (Lymantria dispar L) development was researched. The effect of host plant was determined based on the parameters which characterize the diet, growth and efficacy of conversion of ingested food of the third instar caterpillars. Along with the effect on development, the effect of host plant on the efficacy of biological preparation based on the bacterium Bacillus thuringiensis var. kurstaki in gypsy moth caterpillar suppression was also researched. The differences in parameters characterizing the diet, growth, and efficacy of ingested food between experimental groups of caterpillars grown on poplar and Turkey oak leaves are explained by the differences in the chemical composition of the leaves of these tree species. The efficacy of Btk preparation is conditioned by the mechanism and content of different groups of defense substances in the leaves of the applied tree species.

scholarly journals Influence of different oak species (Q. cerris L. and Q. robur L.) and environment conditions on the gypsy moth development

2005 ◽  
pp. 99-110 ◽  
Author(s):  
Slobodan Milanovic ◽  
Nenad Markovic
Keyword(s):  
Sex Ratio ◽  
Host Plant ◽  
Plant Species ◽  
Gypsy Moth ◽  
Environmental Conditions ◽  
Pedunculate Oak ◽  
Controlled Conditions ◽  
Study Results ◽  
Significant Difference ◽  
Turkey Oak

This paper presents the results of the laboratory study of gypsy moth development on Q. cerris and Q. robur foliage in controlled and uncontrolled environmental conditions. The survival is higher in controlled conditions than in uncontrolled conditions. In uncontrolled conditions, sex ratio is higher in individuals fed on pedunculate oak foliage (0.55) compared to those fed on Turkey oak foliage (0.39), while in the controlled conditions the situation is the opposite. The increase of in star number is greater in pedunculate oak than in Turkey oak. There is a statistically significant difference between the means of all the study characters (length of development of the first and the second instars, length of premarital development, number of instars and fecundity) in uncontrolled and controlled environmental conditions. Also, there is a statistically significant difference between the means of all the study characters on different oak species, except in fecundity. There is an interaction between environmental conditions and host plant species in the length of development of the first and the second instars, as well as in the number of instars during the development. The study results show that Turkey oak is more favorable for the gypsy moth development than pedunculate oak.

Effect of health education on awareness and practices of breast self-examination among females attending a charitable hospital at North Karachi

2021 ◽  
Vol 71 (9) ◽  
Author(s):  
Zohra Jabeen ◽  
Nighat Shah ◽  
Zaeema Ahmer ◽  
Sulhera Khan ◽  
Amir Hussain Khan ◽  
...  
Keyword(s):  
Health Education ◽  
Intervention Group ◽  
Positive Association ◽  
Control Group ◽  
Low Resource ◽  
Resource Setting ◽  
Low Resource Setting ◽  
Study Results ◽  
Quasi Experimental ◽  
And Performance

Abstract Objective: The objective of this study was to compare the effectiveness of health education as an intervention to promote BSE among intervention and non-intervention group presenting in a low resource setting at North Karachi Methodology: This Quasi-experimental study was conducted from January-August 2018 in a charitable hospital in Karachi after taking ethical approval by the Institutional Review Board of Jinnah Sindh Medical University and relevant approvals from the hospital authorities. This study recruited 172 eligible women by dividing them into intervention (n=86) and control (n=86) groups from a low resource setting in Karachi. Demographic variables were collected through pretested questionnaire by interview. Intervention group then received health education regarding carcinoma of breast, importance of BSE and monthly motivation to perform BSE through cell phone. The questionnaire was again filled after 6 months of intervention. Control group was also given health education sessions upon completion of study. Results: Results revealed that both groups were similar initially. After 6 months females in intervention group showed significant (p=<0.001) improvement in knowledge and performance of BSE from 44.2% to 88.4% but there was no change in control group. Being in intervention group (RR=2.714, 95% CI= 1.760 - 4.186, p=0.001) and education (RR=0.573, 95% CI= 0.361 - 0.910, p=0.018) showed positive association with BSE performance. Upon adjusting with age, marital status, family history and education, intervention group (RR=2.570, 95% CI= 1.654 - 3.992, p= 0.001) remained significant while education (RR=1.466, 95% CI =0.910 - 2.363, p=0.116) became insignificant. Continuous...

scholarly journals Task dependence of odor discrimination: choosing between speed and accuracy

2018 ◽  
Vol 119 (2) ◽  
pp. 377-379 ◽  
Author(s):  
Jack Brooks ◽  
Jennifer Nicholas ◽  
Jennifer J. Robertson
Keyword(s):  
Experimental Design ◽  
Odor Discrimination ◽  
Sampling Time ◽  
Complex Task ◽  
Evidence Accumulation ◽  
Task Dependence ◽  
Study Results ◽  
Olfactory Processing ◽  
And Performance ◽  
Speed And Accuracy

Odor discrimination is a complex task that may be improved by increasing sampling time to facilitate evidence accumulation. However, experiments testing this phenomenon in olfaction have produced conflicting results. To resolve this disparity, Frederick et al. (Frederick DE, Brown A, Tacopina S, Mehta N, Vujovic M, Brim E, Amina T, Fixsen B, Kay LM. J Neurosci 37: 4416–4426, 2017) conducted experiments that suggest that sampling time and performance are task dependent. Their findings have implications for understanding olfactory processing and experimental design, specifically the effect of subtle differences in experimental design on study results.

Penetration of weeds into the herbaceous understorey and soil seed bank of a Turkey oak-sessile oak forest in Hungary

2011 ◽  
Vol 12 (2) ◽  
pp. 227-233 ◽  
Author(s):  
G. Koncz ◽  
P. Török ◽  
M. Papp ◽  
G. Matus ◽  
B. Tóthmérész
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Oak Forest ◽  
Sessile Oak ◽  
Turkey Oak

Formation and Simulation of Cutting-Direction Burr in Orthogonal Cutting

2007 ◽  
Vol 24-25 ◽  
pp. 249-254 ◽  
Author(s):  
Hai Jun Qu ◽  
Gui Cheng Wang ◽  
Hong Jie Pei ◽  
Qin Feng Li ◽  
Yun Ming Zhu
Keyword(s):  
Shear Zone ◽  
Formation Process ◽  
Orthogonal Cutting ◽  
Shear Angle ◽  
Burr Formation ◽  
Size And Shape ◽  
Study Results ◽  
Edge Quality ◽  
And Performance ◽  
Cutting Direction

The cutting-direction burr is one of the important factors that influence the edge quality and performance of precision parts. The cutting-direction burr formation process is simulated with DeformTH3D. The mechanism of cutting-direction burr formation is analyzed in terms of the results of the simulation. The negative shear zone and initiation negative shear angle are discussed too. Study results show that the deformation of CDE is an important factor affect the cutting direction burrs’ size and shape.

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