Euonymus Scale (Homoptera: Diaspididae) Effects on Plant Growth and Leaf Abscission and Implications for Differential Site Selection by Male and Female Scales

1990 ◽  
Vol 83 (3) ◽  
pp. 995-1001 ◽  
Author(s):  
S. D. Cockfield ◽  
D. A. Potter
Keyword(s):  
Plant Growth ◽  
Site Selection ◽  
Leaf Abscission ◽  
Male And Female ◽  
Euonymus Scale

Activity patterns, movements and burrows of platypuses (Ornithorhynchus anatinus) in a sub-alpine Tasmanian lake

2000 ◽  
Vol 48 (6) ◽  
pp. 701 ◽  
Author(s):  
Helen M. Otley ◽  
Sarah A. Munks ◽  
Mark A. Hindell
Keyword(s):  
Adult Male ◽  
Site Selection ◽  
Activity Patterns ◽  
Predation Pressure ◽  
Water Bodies ◽  
Male And Female ◽  
Frequent Use ◽  
Ornithorhynchus Anatinus ◽  
North Western ◽  
Tracking Period

Adult male and female platypuses were radio-tracked in summer and winter at Lake Lea, north-western Tasmania. They appeared to exhibit greater diurnality, particularly during winter months, a greater degree of overland movement and more frequent use of non-earth refuge sites than do animals inhabiting mainland water bodies. Individuals foraged continuously for up to 16 h, with longer foraging bouts observed during the winter tracking period. Foraging range varied between 2 and 58 ha, with no significant differences observed between the sexes or seasons. All platypuses foraged predominantly in the lake; however, a number of animals were observed moving overland to and from waterbodies and burrows. Burrows were located on lake, creek and pool edges. A high percentage of burrows (25%) were located within dense sedge tussocks and scrub vegetation. Both the terrestrial activity and more opportunistic burrow-site selection may be related to reduced predation pressure in Tasmania.

scholarly journals Maternal influence on feeding site selection of male and female lambs

animal ◽  
2014 ◽  
Vol 8 (6) ◽  
pp. 991-999
Author(s):  
R.L. Wesley ◽  
A.F. Cibils ◽  
C.M. Black-Rubio ◽  
E.R. Pollak ◽  
S.A. Utsumi
Keyword(s):  
Site Selection ◽  
Maternal Influence ◽  
Male And Female ◽  
Feeding Site ◽  
Selection Of ◽  
Feeding Site Selection

scholarly journals Application of Electrical Geophysical Method in Site Selection for Viable Area for Agricultural Practices: A Case Study of Ukpenu-Ibhiese and Iruekpen Edo State-Nigeria

2021 ◽  
pp. 44-54
Author(s):  
Aigbedion Isaac ◽  
Salufu Samuel
Keyword(s):  
Plant Growth ◽  
Soil Nutrients ◽  
Site Selection ◽  
Agricultural Practices ◽  
Soil Test ◽  
Geophysical Method ◽  
Test Analysis ◽  
Time Dynamics ◽  
Phosphorus And Potassium

Electrical geophysical method was applied, to select viable area with essential soil nutrients for plant’s growth. Conventional soil test analysis was carried out for the purpose of confirmation. A case study was done at Ukpenu-Ibhiese and Iruekpen in Ekpoma. The result of the electrical resistivity geophysical method showed that southwest and northwest of the area has resistivity values that ranged between 80Ωm to 170Ωm while the remaining part of the area has values higher than  170Ωm, ranged from  580Ωm to 950Ωm. Values of organic matter, Nitrogen, Phosphorus, and Potassium,  obtained from the soil test in area with 80Ωm to 170Ωm indicated good proportion of essential soil nutrients for plant growth while area with resistivity values that ranged from 580Ωm to 950Ωm was deficient in essential soil nutrients for plant growth. The results further proved that soil electrical physical properties thus detected and mapped can be used as a proxy of physical, chemical, and biological features relevant for the appropriate site selection and soils management, based on their resistivity behavior, spatial variability, and time dynamics in the area of study.

scholarly journals Influence of plant growth regulators on vegetative growth, sex expression and yield of summer bottle gourd

2020 ◽  
Vol 44 (4) ◽  
pp. 577-590
Author(s):  
M Moniruzzaman ◽  
R Khatoon ◽  
M Moniruzzaman ◽  
AKM Qamruzzaman
Keyword(s):  
Sex Ratio ◽  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Female Flower ◽  
Sex Expression ◽  
Fruit Weight ◽  
Bottle Gourd ◽  
Male And Female ◽  
Female Flowers

Field experiments on bottle gourd variety ‘BARI Lau -4’ were conducted at the Plant Physiology field of Horticulture Research Center, Bangladesh Agricultural Research Institute, Gazipur during two consecutive summer seasons of 2015 and 2016 to investigate the effect of plant growth regulators on growth, sex expression, yield and yield components of the crop. The experiment consisted of different concentrations of Gibberellic acid (GA3), Naphthalene acetic acid (NAA), Maleic hydrazide (MH) and single concentration of cycocel (CCC) viz., GA3 @ 10 ppm, GA3 @ 30 ppm, NAA @100 ppm, NAA @ 150 ppm, MH @ 50 ppm, MH @ 150 ppm and CCC @ 500 ppm along with distilled water considered as control. All growth regulators were sprayed to the seedlings at two-leaf stage and 4 days after the first spray. Growth regulator treatments had significant effect on primary branches/plant, node number of 1st male and female flower appearance, number of days to 1st male and female flower appearance, number of male and female flowers, sex ratio (male:female flower) number of fruits/plant, individual fruit weight and fruit yield. Spraying of MH @ 150 ppm gave the highest primary branches/plant (17.0 and 18.0 in first and 2nd year, respectively) and induced maximum female flowers (37.3 and 40.0 in first and 2nd year, respectively) at lower nodes followed by CCC @ 500 ppm (36.3) in the first year and MH @ 50 ppm (40.0) in the 2nd year. Application of MH @ 150 ppm caused early appearance of female flowers on the nearest node (from bottom). Application of MH @ 150 ppm gave the lower number of male flowers (81.7 and 96.0 in first and 2nd year, respectively) and the highest number of female flowers/plant, thereby producing lower male:female sex ratio (2.2 and 2.5 in first and 2nd year, respectively) and the maximum number of fruits/plant (12.0 and 14.0 in first and 2nd year, respectively). The maximum fruit weight/plant was obtained from the application of MH @ 150 ppm (29.3 and 35.8 in first and 2nd year, respectively) followed by CCC @ 500 ppm (26.0 in the 1st year and 29.0 in 2nd year). The highest fruit yield per hectare was recorded significantly with the application of MH @ 150 ppm (97.6 t/ha and 89.6 t/ha in first and 2nd year, respectively) closely followed by CCC @ 500 ppm (88.5 t/ha in 2015) and GA3 @ 30 ppm (75.3 t/ha in 2016), as compared to other treatments. The highest mean yield over the years was also recorded at MH @ 150 ppm (93.6 t/ha) followed by CCC @ 150 ppm (80.6 t/ha) and GA3 30 (74.1). Application of MH @ 150 ppm gave the maximum gross return and net return with the highest BCR of 5.24 followed by CCC 500 ppm (4.15) and GA3 30 ppm (3.86). Bangladesh J. Agril. Res. 44(4): 577-590, December 2019

scholarly journals Dikegulac Promotes Abscission in Citrus

HortScience ◽  
2004 ◽  
Vol 39 (7) ◽  
pp. 1655-1658 ◽  
Author(s):  
Luis Pozo ◽  
Ana Redondo ◽  
Ulrich Hartmond ◽  
Walter J. Kender ◽  
Jacqueline K. Burns
Keyword(s):  
Side Effects ◽  
Plant Growth ◽  
Plant Growth Regulator ◽  
Citrus Sinensis ◽  
Leaf Abscission ◽  
Application Time ◽  
Valencia Orange ◽  
Application Date ◽  
Orange Trees ◽  
Earlier Application

Two formulations of the plant growth regulator dikegulac (2,3:4,6-di-O-isopro-pylidene-α-L-xylo-2-hexulofuranosoic acid), consisting of dikegulac-sodium (Atrimmec) or dikegulac:ascorbic acid (1:1) (DAA), as well as 5-chloro-3-methyl-4-nitro-pyrazole at 200 mg·L-1, were applied as foliar sprays to `Hamlin' and `Valencia' orange trees (Citrus sinensis L. Osbeck) at two dates during the harvest season for each cultivar (11 Nov. and 10 Jan. for `Hamlin', 22 Mar. and 25 May for `Valencia'). Fruit detachment force was evaluated 10 days after application, whereas cumulative leaf abscission was monitored up to 60 days after application. In both cultivars, Atrimmec and DAA at 3,000 mg·L-1 induced moderate fruit loosening when applied at the earlier application date, but fruit loosening improved when applied at the later application date. In `Hamlin', both formulations caused higher leaf abscission when applied at the later date. DAA applications resulted in low leaf loss in `Valencia' regardless of application time, whereas Atrimmec caused unacceptably high leaf loss at either application date. No differences in internal fruit quality were found as a result of any abscission material treatment. The results indicate that DAA could be a promising option to induce fruit loosening in late harvested `Valencia' orange trees with minimal undesirable side effects.

Aspects of the comparative behavior of red-eyed and Philadelphia vireos

1977 ◽  
Vol 55 (3) ◽  
pp. 528-542 ◽  
Author(s):  
Jon C. Barlow ◽  
James C. Rice
Keyword(s):  
Site Selection ◽  
Nest Site ◽  
Field Studies ◽  
Pair Formation ◽  
Nest Site Selection ◽  
The Body ◽  
Northern Ontario ◽  
Male And Female ◽  
Species Pairs ◽  
Red Eyes

Specific postural and vocal displays in successive stages of the nesting cycle are compared between sympatric red-eyed and Philadelphia vireos based on 9 years of field studies in Ontario and elsewhere. Vireos reach northern Ontario between mid-May and early June. Territorial behavior, including crest-erect alert, head forward threat, tail-fanning, and gaping, are seen in both species but at different frequencies. Physical encounters include supplanting, circle chasing, pecking, and grappling. Epigamic behavior begins immediately in both with pair formation, which differs only in timing between the two species. Pairs are maintained by male and female wing-quiver, female squat, and male swaying displays. Swaying in red-eyed vireos involves feather erection, tail-fanning, and continuous asynchronous swaying of the body, head, and neck. Swaying is simpler in Philadelphia vireos. Intrapair aggression, displacement preening, and interruptions of courting birds by third adults are discussed. Special vocalizations: 'myaah' and warbling song (red-eyes) and 'ehhh,' 'bubble' song, and contact notes (Philadelphias) are discussed. Nest site selection and nest building are done only by females in both species. Philadelphia vireo males incubate; red-eyed vireo males do not. Males of both species feed nestlings and fledglings. Evolutionary implications of the display and behavioral patterns of the two species are discussed.

The Clinical, Roentgenological and Morphological Effects of an Acute Exposure of Phosgene on the Lungs of Dogs

1971 ◽  
Vol 29 ◽  
pp. 236-237
Author(s):  
R. F. Bils ◽  
W. F. Diller ◽  
F. Huth
Keyword(s):  
Latent Period ◽  
Chemical Industry ◽  
Toxic Substance ◽  
Lung Edema ◽  
X Rays ◽  
Beagle Dogs ◽  
Male And Female ◽  
Morphological Alterations ◽  
Before And After ◽  
Electron Microscopes

Phosgene still plays an important role as a toxic substance in the chemical industry. Thiess (1968) recently reported observations on numerous cases of phosgene poisoning. A serious difficulty in the clinical handling of phosgene poisoning cases is a relatively long latent period, up to 12 hours, with no obvious signs of severity. At about 12 hours heavy lung edema appears suddenly, however changes can be seen in routine X-rays taken after only a few hours' exposure (Diller et al., 1969). This study was undertaken to correlate these early changes seen by the roengenologist with morphological alterations in the lungs seen in the'light and electron microscopes.Forty-two adult male and female Beagle dogs were selected for these exposure experiments. Treated animals were exposed to 94.5-107-5 ppm phosgene for 10 min. in a 15 m3 chamber. Roentgenograms were made of the thorax of each animal before and after exposure, up to 24 hrs.

Sign in / Sign up

Export Citation Format

Share Document