Variability for Response to Herbicides in Wild Oat (Avena fatua) Populations

Weed Science ◽  
1985 ◽  
Vol 33 (6) ◽  
pp. 829-835 ◽  
Author(s):  
Kiet M. Thai ◽  
Sakti Jana ◽  
James M. Naylor
Keyword(s):  
Growth Parameters ◽  
Seedling Emergence ◽  
Leaf Length ◽  
Avena Fatua ◽  
Population Variation ◽  
Controlled Environment ◽  
Seedling Height ◽  
Wild Oat ◽  
Experimental Conditions ◽  
Environment Chamber

Reaction of some wild oat (Avena fatuaL. ♯4AVEFA) populations to the herbicide triallate [S-(2,3,3-trichloroallyl)diisopropylthiocarbamate] was investigated in a controlled-environment chamber. Under specified conditions, 1.0 mg active ingredient of triallate incorporated in 1 kg of soil was a satisfactory diagnostic rate for 14-day-old seedlings. Five seedling growth parameters were studied. These parameters were emergence, survival to produce first leaf, mesocotyl length, first-leaf length, and seedling height. Of these, mesocotyl length was least affected by triallate treatment, and significant differences in variability for triallate reaction were found within and among historically triallate unexposed, as well as exposed populations. Within-population variation for seedling emergence and survival was higher in unexposed than in exposed populations. Populations with recurrent exposure to triallate were more tolerant to the herbicide under experimental conditions than historically unexposed populations. Triallate-tolerant lines were identified which were tolerant to two other common wild oat herbicides.

EFFECTS OF SOIL TEMPERATURE ON THE PHYTOTOXICITY OF TRIFLURALIN TO WILD OATS

1980 ◽  
Vol 60 (3) ◽  
pp. 929-938 ◽  
Author(s):  
A. L. DARWENT
Keyword(s):  
Soil Temperature ◽  
Shoot Growth ◽  
Avena Fatua ◽  
Controlled Environment ◽  
Wild Oat ◽  
Wild Oats ◽  
Soil Temperatures

Experiments were conducted in the field and in controlled environment chambers at Beaverlodge, Alberta to determine the influence of soil temperature on the phytotoxicity of trifluralin (α,α,α-trifluoro-2,6-dinitro-N, N-dipropyl-p-toluidine) to wild oats (Avena fatua L.). In the field trifluralin reduced wild oat emergence the most in early May when soil temperatures were lowest. As soil temperatures increased in May, the effectiveness of trifluralin in reducing wild oat emergence declined. In controlled environment studies, the effectiveness of trifluralin in reducing wild oat shoot growth was greatest at 4 °C. At 7.5 °C, the effectiveness of trifluralin in reducing wild oat shoot growth declined. However, at both 10 and 20 °C, small increases in trifluralin phytotoxicity occurred. Exposure of wild oat shoots to trifluralin vapors at 7.5 and 20 °C indicated decreased shoot growth of wild oats at 7.5 °C but increased volatilization of trifluralin at 20 °C. Thus, the lack of any major differences in the effectiveness of trifluralin in reducing wild oat shoot growth at temperatures from 7.5 to 20 °C may be due to the counteraction of these two phenomena.

Antagonistic Effects of MCPA on Wild Oat (Avena fatua) Control with Diclofop

Weed Science ◽  
1981 ◽  
Vol 29 (5) ◽  
pp. 566-571 ◽  
Author(s):  
Wayne A. Olson ◽  
John D. Nalewaja
Keyword(s):  
Acetic Acid ◽  
Indole Acetic Acid ◽  
Treatment Temperature ◽  
Avena Fatua ◽  
Propanoic Acid ◽  
Controlled Environment ◽  
Wild Oat ◽  
Anisic Acid ◽  
Dichlorophenoxy Acetic Acid ◽  
Root Inhibition

Experiments were conducted in the field, greenhouse, and controlled environment chambers to determine the extent to which MCPA {[(4-chloro-o-tolyl)oxy] acetic acid} antagonizes wild oat (Avena fatuaL.) control with diclofop {2-[4-(2,4-dichlorophenoxy)phenoxy] propanoic acid}. Wild oat control with diclofop at 1 kg/ha was reduced from 96% when used alone to 76, 48, 31, and 14% by tank mixture with IAA (3-indole acetic acid), MCPA, 2,4-D [(2,4-dichlorophenoxy)acetic acid], or dicamba (3,6-dichloro-o-anisic acid), respectively. Wild oat control with diclofop applied alone at 1.1 kg/ha was similar to that of diclofop at 2.2 kg/ha applied as a tank mixture with MCPA at 0.15 or 0.3 kg/ha. MCPA antagonism of wild oat control with diclofop increased as the post-treatment temperature increased from 10 to 30 C. MCPA antagonism of wild oat control with diclofop was the same whether the herbicides were applied to the foliage only or to the foliage and soil. Approximately 20% of the wild oat root inhibition with diclofop applied postemergence, however, was from diclofop uptake from the soil. MCPA at 0.6 kg/ha did not reduce wild oat control when applied as a sequential treatment 2 days before or 1 day after diclofop at 1.1 kg/ha.

scholarly journals The impact of seed burial depths and post-emergence herbicides on seedling emergence and biomass production of wild oat (Avena fatua L.): Implications for management

PLoS ONE ◽  
2020 ◽  
Vol 15 (10) ◽  
pp. e0240944
Author(s):  
Muhammad Mudassar Maqbool ◽  
Shazia Naz ◽  
Tasneem Ahmad ◽  
Muhammad Shahid Nisar ◽  
Hassan Mehmood ◽  
...  
Keyword(s):  
Biomass Production ◽  
Seedling Emergence ◽  
Avena Fatua ◽  
Wild Oat ◽  
Seed Burial ◽  
The Impact

scholarly journals Mutagenic effects of sodium azide on the survival and morphological characters of tomato varieties

2020 ◽  
Vol 37 (1) ◽  
pp. 55-62
Author(s):  
C.A. Adeosun ◽  
K.A. Elem ◽  
C.D. Eze
Keyword(s):  
Sodium Azide ◽  
Growth Parameters ◽  
Block Design ◽  
Crop Improvement ◽  
Morphological Variability ◽  
Morphological Characters ◽  
Leaf Length ◽  
Experimental Conditions ◽  
Tomato Crop ◽  
The Difference

Sodium Azide (SA)-induced mutagenic variability was studied on four tomato varieties namely Roma vf, Roma savannah, Tropimech and Tima. The SA concentrations used were 0.1%, 0.3%, 0.5% and 0.7%, with 0.0% as control to determine the percentage emergence and growth parameters of the tomato varieties. The plant seeds were pretreated with the various concentrations of the mutagen before planting. The seedlings were raised in the nursery and transplanted after 30 days of planting into the field in polythene bags filled with 70g of a mixture of soil and farm yard manure. The experiment was carried out in randomised complete block design with three replicates. Increase in SA concentration caused a remarkable decrease in the percentage emergence and all other growth parameters evaluated. The effect of the interaction between variety and SA concentration revealed that the interaction was not significantly different from the control at P≤0.05 on the number of leaves, number of branches and leaf length, but the difference was significant for plant height. Formation of two stems was observed at 0.3% Sodium Azide for Roma vf. variety. The 0.1% and 0.3% concentrations of Sodium Azide seem to be promising treatments under the experimental conditions and thus could be used to induce variations for tomato crop improvement. Tima and Roma savannah performed better and were resistant to the mutagen than other varieties, hence they can be recommended as good varieties for further breeding purposes; also Sodium Azide could be a good mutagen for the improvement of tomato plants. Keywords: Tomato, growth characters, mutagenic, Sodium Azide, morphological variability.

Temperature Effect on Difenzoquat Phytotoxicity

Weed Science ◽  
1984 ◽  
Vol 32 (2) ◽  
pp. 150-153 ◽  
Author(s):  
Stephen D. Miller ◽  
John D. Nalewaja ◽  
Adam Dobranski
Keyword(s):  
Triticum Aestivum ◽  
Hordeum Vulgare ◽  
Temperature Effect ◽  
Spring Wheat ◽  
Avena Fatua ◽  
Controlled Environment ◽  
Wild Oat ◽  
Night Temperature ◽  
Hard Red Spring Wheat ◽  
Temperature Environment

The phytotoxicity of difenzoquat (1,2-dimethyl-3,5-diphenyl-1H-pyrazolium) applied to the three-leaf stages of hard red spring wheat (Triticum aestivumL. ‘Waldron’ and ‘Era’), barley (Hordeum vulgareL. ‘Beacon’) and wild oat (Avena fatuaL. ♯ AVEFA) grown under constant, fluctuating, or alternating day-night temperatures was determined in controlled environment chambers. Difenzoquat injury to wild oat and Era wheat was greater at a constant 20 or 30 than at 10 C; however, injury to Waldron wheat was similar at 10, 20, and 30 C. Difenzoquat caused only slight injury to barley, and injury was similar at all temperatures. In Era wheat, selectivity of difenzoquat for wild oat was maximum with a 10-C night temperature in an otherwise 30-C-temperature environment; in Beacon barley selectivity was maximum with 3 or more days of 20- or 30-C posttreatment temperature; and in Waldron wheat selectivity was not adequate at any of the temperatures studied.

Difenzoquat Effectiveness as Influenced by Time of Day at Application

Weed Science ◽  
1985 ◽  
Vol 33 (1) ◽  
pp. 78-81 ◽  
Author(s):  
E. James Retzinger ◽  
John D. Nalewaja
Keyword(s):  
Field Experiments ◽  
Time Of Day ◽  
Avena Fatua ◽  
The Other ◽  
Controlled Environment ◽  
Wild Oat ◽  
Time Of Application

Experiments were conducted in the field and controlled-environment chambers to determine wild oat (Avena fatuaL. # AVEFA) control with difenzoquat (1,2-dimethyl-3,5-diphenyl-1H-pyrazolium) as influenced by applications at 4-h intervals during the day. Difenzoquat phytotoxicity was significantly higher in four of the six field experiments when applied at 1300 and 1700 h than at other times and was increased in the other two experiments. Difenzoquat phytotoxicity increased with temperature at treatment in the field experiments. Wild oat control was not increased by 8 h of 28 C before or after difenzoquat application compared to a constant 18 C in controlled-environment chambers. In controlled-environment chambers, wild oat control with difenzoquat was not influenced by the time of application during the day when humidity and temperature were kept constant.

scholarly journals Germination and Growth response of Tetrapleura tetraptera (Shum and Thonn) to Different Growth media.

2019 ◽  
Vol 7 (3) ◽  
Author(s):  
Inelo Ajuma Usman ◽  
Mark Uleh ◽  
Chinoso Deborah Onyeri
Keyword(s):  
Growth Parameters ◽  
Daily Basis ◽  
Germination Percentage ◽  
Leaf Length ◽  
Growth Media ◽  
Seedling Height ◽  
Randomized Design ◽  
Tetrapleura Tetraptera ◽  
Number Of Leaves ◽  
Viable Seeds

This study investigated the effect of growth media on the germination and early growth of Tetrapleura tetraptera (Shum andThonn) This was assessed at the Forestry Nursery Federal University of Agriculture Makurdi, Benue State, Nigeria.  Two hundred (200) viable seeds were immersed in 50% sulphuric acid at 15mins. The seeds after pretreated were sown on five different media namely: Top soil, Sawdust, Riversand, mixture of topsoil and riversand and mixture of riversand and sawdust. Completely Randomized Design was adopted for this experiment. Data were collected on percentage germination on daily basis for 4 weeks, growth parameters involving seedling height, number of leaves, girth and leaf length at 2 weeks interval for 8 weeks. Analysis of Variance (ANOVA) was used to analyze the data collected. Mean separation was carried out for significantly different parameter by using Duncan’s Multiple Range Test (DMRT) to determine the suitable growth media. The result showed that germination percentage was significant as 5% level of probability (p>0.05) and the highest germination percentage of 80% was recorded in Riversand+Sawdust. Growth parameters were also influenced by growth media.  The highest number of leaves was observed in topsoil(10.05), seedling height (7.88cm) in Riversand +sawdust, girth(0.57cm) in topsoil and leaf length (4.71cm) in sawdust.  In raising the seeds of Tetrapleura tetraptera , Riversand and sawdust should be used. To encourage domestication and conservation of Tetrapleura tetraptera, topsoil,  mixture of riversand and sawdust should be adopted since we are interested in growth of tree species and this will ensure the production of vigorous seedlings for its plantation establishment.Keywords: Growth media, domestication, germination, Tetrapleura tetraptera

Sign in / Sign up

Export Citation Format

Share Document