scholarly journals EVALUATION OF INUNDATIVE RELEASES OF TRICHOGRAMMA EXIGUUM (HYMENOPTERA: TRICHOGRAMMATIDAE) FOR SUPPRESSION OF NANTUCKET PINE TIP MOTH (LEPIDOPTERA: TORTRICIDAE) IN PINE (PINACEAE) PLANTATIONS

2000 ◽  
Vol 132 (3) ◽  
pp. 373-386 ◽  
Author(s):  
David B. Orr ◽  
Charles P-C. Suh ◽  
Kenneth W. Mccravy ◽  
C. Wayne Berisford ◽  
Gary L. Debarr
Keyword(s):  
Loblolly Pine ◽  
Soil Surface ◽  
First Year ◽  
Egg Survival ◽  
Significant Difference ◽  
Nantucket Pine Tip Moth ◽  
Rhyacionia Frustrana ◽  
Female Longevity ◽  
And Control ◽  
Inundative Releases

AbstractInundative releases of Trichogramma exiguum Pinto and Platner were evaluated for suppression of the Nantucket pine tip moth, Rhyacionia frustrana (Comstock), in first-year loblolly pine, Pinus taeda L., plantations. Three releases, spaced 7 d apart, were made in three 0.4-ha plots during second-generation R. frustrana egg deposition. Each release included three cohorts of T. exiguum developmentally separated by 25 degree-days. Mean ± SD field release rate for each cohort was 328 238 ± 88 379 females/ha. Mean T. exiguum emergence under laboratory conditions for released cohorts was 96 ± 2%, with 74 ± 3% females, of which 1 ± 1% of females displayed brachyptery; female longevity was 18 ± 3 d. Field emergence averaged 96 ± 4%. Parasitism of R. frustrana eggs was significantly increased, ranging from 40 ± 19 to 73 ± 22% in T. exiguum-treated plots and 17 ± 17 to 67 ± 21% in control plots. Data from all treated plots combined showed R. frustrana egg survival (hatching) was significantly reduced by 46%, and larval populations were significantly reduced by 60%. There was no significant difference in the percentage of terminals damaged between T. exiguum-treated (31 ± 16%) and control plots (45 ± 10%); however, length of terminal damage was significantly lower in treated plots. The percentage of damage to top whorl shoots was significantly lower in T. exiguum-treated plots compared with control plots, but there was no significant difference in length of tunneling damage. Damage to remaining shoots was not significantly different between T. exiguum-treated and control plots. Microhabitat significantly influenced both mean maximum and minimum temperature and the number of consecutive hours per day that were at or above 35 °C (critical temperature for T. exiguum survival). Soil surface with no cover had the greatest number of hours at or above 35 °C, followed by soil surface with herbaceous cover, and canopies of small trees (0.4 m tall). Canopy habitats in larger trees (0.9–1.8 m tall) had the most moderate temperature conditions. Parasitoid emergence was significantly reduced in response to increasing number of consecutive hours at or above 35 °C. Predation of parasitoids prior to emergence was significantly affected by microhabitat and by the length of time capsules were in the field before T. exiguum emergence (i.e., cohort number).

Spatial Distribution of the Nantucket Pine Tip Moth (Lepidoptera: Tortricidae) in Newly Established Loblolly Pine Plantations

1990 ◽  
Vol 25 (2) ◽  
pp. 209-215
Author(s):  
S. R. Clarke ◽  
F. M. Stephen ◽  
J. E. Dunn
Keyword(s):  
Spatial Distribution ◽  
Loblolly Pine ◽  
First Generation ◽  
Pine Plantations ◽  
First Year ◽  
Nantucket Pine Tip Moth ◽  
Rhyacionia Frustrana ◽  
Second Year

The spatial distribution of trees infested by the Nantucket pine tip moth, Rhyacionia frustrana (Comstock), was examined using random 36 tree samples taken from contiguous quadrats in eight loblolly pine plantations in their first and second year of growth in southwestern Arkansas. Infestations were distributed throughout first-year plantations by the end of the second tip moth generation. The distribution of infested trees was generally random in the first generation, with increasing aggregation in subsequent generations. Factors such as vegetation level may alter this pattern.

scholarly journals The Influence of Teaching Vocabulary by Using Picture

2016 ◽  
Vol 1 (2) ◽  
pp. 159
Author(s):  
Hanik Nuzulimah
Keyword(s):  
Control Group ◽  
First Year ◽  
First Year Students ◽  
Significant Difference ◽  
Post Test ◽  
The Subject ◽  
And Control ◽  
Data Analysis Result ◽  
Experimental Group ◽  
Better Than

This paper attempts to explore whether there is significant difference of achievement in vocabulary between students taught by using pictures and those are not. The subject of this study is the first year students of SLTP Muhammadiyah Simo Susukan, Semarang where the sample contains 50 students that is divided into experimental group (with treatment) and control group (without treatment). The data is gathered from participants’ score obtained from pre test and post test. Using t test as technique of data analysis, result shows that students taught by using pictures perform better than those are not. It means that there is significant difference between the two groups. Keywords: Vocabulary Teaching; Picture

scholarly journals First year seed softening in three Hedysarum spp. in southern Queensland

2003 ◽  
Vol 43 (11) ◽  
pp. 1303 ◽  
Author(s):  
L. W. Bell ◽  
D. L. Lloyd ◽  
K. L. Bell ◽  
B. Johnson ◽  
K. C. Teasdale
Keyword(s):  
Soil Surface ◽  
First Year ◽  
Hard Seed ◽  
Seed Content ◽  
Constant Rate ◽  
Significant Difference ◽  
Hard Seeds ◽  
Hedysarum Coronarium ◽  
Seed Characteristics ◽  
Selection Of

Seed softening was investigated in 41 lines of Hedysarum coronarium, 5 lines of H. carnosum and 8�lines of H. flexuosum grown at Oakey, Queensland in 2000. After testing for initial hard seed content in each line, the remaining hard seeds were placed on the soil surface at Kingsthorpe on 15 January 2001. Changes in hard seed levels over the ensuing summer-autumn seed softening period were measured. The initial hard seed content in each species ranged from 20 to 79% in H. coronarium; 31 to 79% in H. carnosum; and 54 to 83% in H. flexuosum. No significant difference in the time of seed softening between accessions or species was identified. Despite the similar timing, the extent of softening varied greatly between accessions and species. The proportion of initially hard seed that softened ranged from 54 to 95% in H. coronarium; 27 to 45% in H. carnosum; and 50 to 74% in H. flexuosum. Accessions of H. coronarium and H. flexuosum softened the greatest proportion of seed between 15 January and 22�February with reducing amounts thereafter. Accessions of H. carnosum softened less seed over this period, appearing to display a slower, more constant rate of softening. Although total hard seed levels were relatively low, there was sufficient variability in hard seed levels to provide some scope for selection of desired hard seed characteristics.

scholarly journals Effectiveness of different ways of presenting neuroanatomy illustration in powerpoint slides on nursing student’s short -term learning memory

2021 ◽  
Vol 7 (1) ◽  
pp. 5-9
Author(s):  
Gyem Dorji ◽  
Kanokwan Wetasin ◽  
Kuenzang Chhezom ◽  
Nargis Sultana ◽  
Minjur Dorji
Keyword(s):  
Nursing Students ◽  
Control Group ◽  
Original Structure ◽  
First Year ◽  
Medical Sciences ◽  
Significant Difference ◽  
Quasi Experimental ◽  
The Subject ◽  
And Control ◽  
Difficult Subject

Introduction: Neuroanatomy is considered as difficult subject as it consists mostly of complicated microscopic structures. However, understanding of the subject structure is very important for nursing students to know its functions and dysfunctions for enhancing nursing practices. To date, teaching neuroanatomy relies heavily on illustrations and the most common way is by using PowerPoint slides, but teachers are often faced with dilemma on how to use illustrations effectively. Therefore, this study was conducted to assess the effectiveness of different ways of presenting neuroanatomy illustrations in PowerPoint slides on nursing students’ short[1]term learning memory. Methods: The quasi-experimental study was conducted at Faculty of Nursing and Public Health, Khesar Gyalpo University of Medical Sciences of Bhutan between June 2020 and November 2020 by comparing an Experimental (n= 70) and a Control group (n= 69) of first year nursing students for their ability to answer questions based on those seven-way slides. Independent sample t-test was used for statistical analysis. Results: Significant difference was found at 95% CI between the performance of the Experimental and Control groups regarding Way 1 (Sequencing of labels) and Way 6 (Magnifying from the original structure) of presentation (tWay 1(135.99) = 2.695, p= .008, d = .458, 95% CI = [0.059, .385]; tWay 6(135.61) = 2.351, p= .020, d = .399, 95% CI = .031, .355], respectively). Conclusions: The use of different ways like sequencing the labels and magnifying from the original structure of presenting illustration in PowerPoint slides are found to be helpful in increasing short[1]term memory in students.

scholarly journals INVESTIGATING THE EFFECT OF SUBSTRATE, MYCORRHIZAL APPLICATION AND BULB SEPARATION ON THE GROWTH OF THE WILD ORCHID ANACAMPTIS PYRAMIDALIS

AGROFOR ◽  
2019 ◽  
Vol 3 (3) ◽  
Author(s):  
Elie KHOURY ◽  
Tony Kevork SAJYAN ◽  
Peter ZHELEV ◽  
Youssef Najib SASSINE
Keyword(s):  
Ex Situ ◽  
First Year ◽  
Orchid Conservation ◽  
Significant Difference ◽  
Anacamptis Pyramidalis ◽  
Rate Of Emergence ◽  
And Control ◽  
Soil Substrates ◽  
Plant Length

Pyramidal orchid (Anacamptis pyramidalis) is a wild terrestrial orchid widelyfound in Lebanon and the Mediterranean zone. Random collection and trade of theorchid for medicinal and edible use (salep) subjected it to a risk of extinction.Consequently, the current work aimed to propagate this orchid in vivo. Orchidbulbs were transplanted from the wild into four different soil substrates (Pinebark,Pinebark-Peat (1/1), Peat-Sand (1/1) and control: soil from the collection site)under controlled conditions of temperature and humidity. The effect of mycorrhizalapplication (MY: Yes) was tested in the different substrates except in control andorchid bulbs (son bulb and mother bulb) were planted combined (SB+MB) or afterseparation of the mother bulb (SB). Same treatments were repeated over twoconsecutive years. Results showed an earlier emergence of son bulbs (SB) grownin control substrate. Moreover, there was a significant difference in plant growthwith superiority for (SB) compared to (SB+MB) regarding plant length andelongation of first leaf except bulb dimensions (length and width) that were higherin (SB+MB). Mycorrhizal application enhanced the overall growth of plants and itseffect was the most obvious in the substrate Peat-Sand (1/1). In general, the bestgrowth of the orchid was observed at the level (SB)/(MY:Yes)/Peat-Sand (1/1).Results of the second experimental year confirmed those of the first year with animprovement of the rate of emergence by 13%. The in vivo propagation methodwas beneficial on improving the growth of A. pyramidalis ex situ and it could beadopted as an initiative for wild orchid conservation.

scholarly journals Impact of Diary Writing Practice on Mental Health of Adolescent Girls

2018 ◽  
Vol 12 ◽  
pp. 56-62
Author(s):  
PRAGYA SINGH LODHI ◽  
DEEPAK SINGH ◽  
GUNJAN SHARMA
Keyword(s):  
Mental Health ◽  
Adolescent Girls ◽  
Control Group ◽  
First Year ◽  
Significant Difference ◽  
Diary Writing ◽  
Independent Variable ◽  
And Control ◽  
The Impact ◽  
Writing Practice

This study has been conducted to study the impact of diary writing on mental health of adolescent girls. A sample of 100 girlsfrom Shri Ram Collage Muzaffernagar (U.P.), who are studying in first year of graduation, was selected from accidental sampling method.Sample was divided into two groups, 50 in experimental group and 50 in control group. Diary writing was selected as the independent variable, which was appliedfor 3 months where girls used to write down their thoughts and feelings; independently 30 minutes each for 5 days a week. Mental health of girls was assessed using the ‘Mental Health Inventory’. Statistical analysis of the data was performed using the SPSS software (version 18) the result indicated that there was a significant difference between experimental and control group on the level of mental health of adolescent girls. The findings of this study indicate that the practice of diary writing significantly improved the level of mental health of adolescent girls.

scholarly journals Landlocked Fall Chinook Salmon Egg Survival during Jar and Tray Incubation at a Production Hatchery

2014 ◽  
Vol 7 (1) ◽  
pp. 29-31 ◽  
Author(s):  
Matthew M. Wipf ◽  
Michael E. Barnes ◽  
Patrick A. Nero ◽  
Jill Voorhees
Keyword(s):  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
First Year ◽  
Egg Survival ◽  
Significant Difference ◽  
Salmon Eggs ◽  
Second Year

This study compared the survival of landlocked fall Chinook salmon Oncorhynchus tshawytscha eggs incubated in either upwelling jars, either with or without daily formalin treatments, or vertically-stacked trays treated daily with formalin in a production hatchery. In the first year of the study, survival to the eyed-egg stage was significantly greater in eggs incubated in jars without formalin compared to trays, but there was no significant difference in survival to hatch between the treatments. In the second year, there were no significant differences in eggs incubated in trays, in jars without formalin treatments, and in jars with formalin treatments. In the final year, there was no significant difference in eyed-egg survival between eggs incubated in trays and jars without formalin, but survival to hatch was significantly greater in the eggs incubated in jars. Jar incubation is recommended to maximize the survival of landlocked fall Chinook salmon eggs.

Monoterpene emissions and cuticular lipids of loblolly and slash pines: potential bases for oviposition preference of the Nantucket pine tip moth

1995 ◽  
Vol 73 (1) ◽  
pp. 21-25 ◽  
Author(s):  
Darrell W. Ross ◽  
Göran Birgersson ◽  
Karl E. Espelie ◽  
C. Wayne Berisford
Keyword(s):  
Loblolly Pine ◽  
Oviposition Preference ◽  
Dry Weight ◽  
Pinus Elliottii ◽  
Slash Pine ◽  
Cuticular Lipids ◽  
Nantucket Pine Tip Moth ◽  
Loblolly Pines ◽  
Rhyacionia Frustrana ◽  
Chain Lengths

Monoterpene emissions from intact 5- to 29-month-old loblolly and slash pine seedlings contained α-pinene, camphene, β-pinene, myrcene, sabinene, β-phellandrene, and limonene. α-Pinene made up > 50% of the volatiles from both species. β-Pinene was significantly more abundant in slash (35.6%) than in loblolly pine (15.3%), while myrcene was significantly more abundant in loblolly (10.9%) than in slash pine (3.4%). Cuticular lipids represented 0.11 and 0.06% of the dry weight biomass of shoots from loblolly and slash pines, respectively. Species differences in cuticular lipid composition were primarily in relative proportions of a group of unidentified compounds that appear to be saturated and unsaturated diols and (or) hydroxy alcohols with chain lengths of about 18 carbons. 10-Nonacosanol made up 16.2 and 14.1% of the total lipids recovered from loblolly and slash pines, respectively. The Nantucket pine tip moth, Rhyacionia frustrana (Comstock), may use these chemical differences to distinguish the susceptible loblolly pines from the resistant slash pines. Key words: Pinus taeda, Pinus elliottii, monoterpene emissions, cuticular lipids, Rhyacionia frustrana.

scholarly journals Nantucket Pine Tip Moth, Rhyacionia frustrana (Comstock) (Insecta: Lepidoptera: Tortricidae)

EDIS ◽  
1969 ◽  
Vol 2005 (2) ◽  
Author(s):  
Wayne N. Dixon
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
The United States ◽  
Cooperative Extension Service ◽  
University Of Florida ◽  
Pine Seedlings ◽  
Nantucket Pine Tip Moth ◽  
Rhyacionia Frustrana ◽  
Growth Loss ◽  
Pinus Taeda L

The Nantucket pine tip moth, Rhyacionia frustrana (Comstock), is a serious pest of young pine in plantations, wild pine seedlings in open areas, Christmas tree plantings, ornamental pines, and pine seed orchards in the United States. Growth loss and stem deformity, caused by larvae feeding inside growing shoots, buds, and conelets, can be considerable during the first five years when most damage occurs (Yates et al. 1981). The increasing population of a preferred host species, loblolly pine (Pinus taeda L.), in Florida poses an ever-increasing problem of Nantucket pine tip moth infestations. This document is EENY-304 (originally published as DPI Entomology Circular 298), one of a series of Featured Creatures from the Entomology and Nematology Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Published: August 2003.  EENY304/IN581: Nantucket Pine Tip Moth, Rhyacionia frustrana (Comstock) (Insecta: Lepidoptera: Tortricidae) (ufl.edu)

Biology and control of Reseda lutea L. 2. Life cycle: seedling emergence, recruitment, and vegetative reproduction

1997 ◽  
Vol 48 (4) ◽  
pp. 517 ◽  
Author(s):  
J. W. Heap
Keyword(s):  
Life Cycle ◽  
Seedling Recruitment ◽  
Vegetative Reproduction ◽  
Seedling Emergence ◽  
Soil Surface ◽  
First Year ◽  
Shoot Production ◽  
Tap Root ◽  
And Control ◽  
Fluctuating Temperatures

The reproductive biology of Reseda lutea L. was studied in the laboratory and field in southern Australia. Seedling emergence was greatest from 5 mm depth (57%) to 10 mm (53%) but also occurred from 80 mm. Seeds on the soil surface did not germinate. Following cultivation of a field population, seedling emergence was high (144/m2) in the first winter and recruitment to the perennial population was estimated at 10·2%. Seedling emergence in subsequent winters was low. Perennial shoot numbers increased gradually in the first year after cultivation, from seedling recruitment and daughter shoots, and then stabilised at around 28/m2. Shoots formed on root fragments at a range of constant and fluctuating temperatures between 10° and 35°C, with a maximum of 17·3 shoots per 50-mm fragment at 15°C. Shoot production increased with root fragment length and diameter. Shoots were produced on root fragments as short as 10 mm and as thin as 1 mm. Fragments from the upper tap root produced more shoots than those from further down the tap root, or from laterals. An illustrated model of the life cycle of R. lutea in Australia is presented.

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