scholarly journals Megacopta cribraria(Hemiptera: Plataspidae) Population Dynamics in Soybeans as Influenced by Planting Date, Maturity Group, and Insecticide Use

2016 ◽  
Vol 109 (3) ◽  
pp. 1141-1155 ◽  
Author(s):  
Alejandro I. Del Pozo-Valdivia ◽  
Nicholas J. Seiter ◽  
Dominic D. Reisig ◽  
Jeremy K. Greene ◽  
Francis P. F. Reay-Jones ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Planting Date ◽  
Maturity Group

Impact of Planting Date on Melanaphis sacchari (Hemiptera: Aphididae) Population Dynamics and Grain Sorghum Yield

2019 ◽  
Vol 112 (6) ◽  
pp. 2731-2736 ◽  
Author(s):  
Nicholas J Seiter ◽  
Anne D Miskelley ◽  
Gus M Lorenz ◽  
Neelendra K Joshi ◽  
Glenn E Studebaker ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Field Experiments ◽  
The United States ◽  
Grain Sorghum ◽  
Planting Date ◽  
Melanaphis Sacchari ◽  
Planting Dates ◽  
Sugarcane Aphid ◽  
Aphid Feeding ◽  
The Impact

Abstract The sugarcane aphid, Melanaphis sacchari (Zehntner) (Hemiptera: Aphididae), has become a major pest of grain sorghum, Sorghum bicolor (L.) Moench, in the United States in recent years. Feeding by large densities of sugarcane aphids causes severe damage, which can lead to a total loss of yield in extreme cases. Our objective was to determine the effect of grain sorghum planting date on sugarcane aphid population dynamics and their potential to reduce yields. We conducted field experiments from 2015 to 2017 in which an aphid-susceptible grain sorghum hybrid was planted at four different dates, which encompassed the typical range of planting dates used in Arkansas production systems. Plots were either protected from sugarcane aphid feeding using foliar insecticide sprays, or left untreated to allow natural populations of sugarcane aphids to colonize and reproduce freely. Planting date impacted both the magnitude and severity of sugarcane aphid infestations, with the highest population densities (and subsequent reductions in sorghum yield) generally occurring on plots that were planted in May or June. Sugarcane aphid feeding reduced yields in the untreated plots in two of the four planting date categories we tested. Earlier planting generally resulted in less sugarcane aphid damage and improved yields compared with later planting dates. While the effect of planting date on sugarcane aphid populations is likely to vary by region, sorghum producers should consider grain sorghum planting date as a potential cultural tactic to reduce the impact of sugarcane aphid.

scholarly journals Soybean maturity group and planting date influence grain yield and nitrogen dynamics

age ◽  
2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Carrie C. Ortel ◽  
Trenton L. Roberts ◽  
Kyle A. Hoegenauer ◽  
Larry C. Purcell ◽  
Nathan A. Slaton ◽  
...  
Keyword(s):  
Grain Yield ◽  
Nitrogen Dynamics ◽  
Planting Date ◽  
Maturity Group

Application Timing of Harvest Aid Herbicides Affects Soybean Harvest and Yield

2011 ◽  
Vol 25 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Joseph M. Boudreaux ◽  
James L. Griffin
Keyword(s):  
Seed Weight ◽  
Sodium Chlorate ◽  
Planting Date ◽  
Maturity Group ◽  
Soybean Yield ◽  
Application Timing ◽  
Seed Moisture ◽  
Herbicide Treatments ◽  
Harvest Aid ◽  
100 Seed Weight

Research was conducted over 2 yr to evaluate soybean response to harvest aid herbicide treatments paraquat at 0.28 kg ai ha−1, paraquat with carfentrazone at 0.014 kg ai ha−1, and sodium chlorate at 6.72 kg ai ha−1. Indeterminate and determinate soybean cultivars were treated when moisture of seed collected from the uppermost four nodes of plants averaged 60, 50, 40, 30, and 20% (± 2%). For each soybean cultivar, the harvest aid treatment by application timing interaction was not significant, and data for harvest aid treatments were averaged. Application of harvest aid at 60% average seed moisture reduced yield for the maturity group (MG) IV indeterminate cultivar 15.4% compared with the nontreated; 100-seed weight was reduced 12.4%. Yield and seed weight were not negatively affected when harvest aid was applied at 50% average seed moisture and soybean was harvested 14 and 15 d before the nontreated control. Although planting date in the 2 yr for the indeterminate cultivar differed by 26 d, number of days from planting to harvest aid application at 50% average seed moisture was 112 and 116 d. For MG V and MG VI determinate cultivars, application of harvest aid at 60% average seed moisture reduced yield compared with the nontreated control 22 and 18.1%, respectively, and at 50% average seed moisture 15.6 and 4%, respectively; seed weight reductions of 8.9 to 33.3% accompanied the yield reductions of the two cultivars. Reduction in soybean yield and seed weight was not observed when harvest aid was applied at 40% average seed moisture, and harvest for the 2 yr was 8 and 9 d earlier for the MG V cultivar and 10 and 14 d earlier for the MG VI cultivar.

scholarly journals Population dynamics of phytoparasitic nematodes in pigeon pea (Cajanus cajan)

1969 ◽  
Vol 83 (3-4) ◽  
pp. 201-208
Author(s):  
Nydia E. Vicente ◽  
Angel Bosques Vega ◽  
Raúl Macchiavelli
Keyword(s):  
Population Dynamics ◽  
Total Population ◽  
Pigeon Pea ◽  
Planting Date ◽  
Nematode Population ◽  
Influential Factor ◽  
Population Fluctuations ◽  
Rotylenchulus Reniformis ◽  
Phytoparasitic Nematodes ◽  
Agricultural Experiment

The effect of planting date, year and pigeon pea line on the population fluctuations of phytoparasitic nematodes associated with pigeon pea was evaluated. Plots were established at the Isabela Agricultural Experiment Station between 1992 and 1994. The pigeon pea lines evaluated were 1-8-2, 1-13, 1-58-1, 1-58-3 y 11-56. Although some differences in the levels of nematode population were observed among years and lines, the maximum population levels were observed from May to July, and the minimum levels from February to April. These levels were more affected by the year than by the pigeon pea line. For each particular year, the maximum or minimum population growth consistently occurred at the same planting date, except in 1994 when the minima populations were erratic. Statistical analysis showed a significant three-way interaction between planting date, pigeon pea line and year, both for Rotylenchulus reniformis and for the total population (R. reniformis, Helicotylenchus sp. and Pratylenchus sp.). For this interaction the most influential factor was year, because the rainfall periods were different over three years. There was a positive correlation between precipitation and both the reniform nematode population and the total population, thus indicating that drastic changes in precipitation, such as those occurring in 1993 and 1994, may significantly affect the population dynamics of phytoparasitic nematodes associated with pigeon pea.

Diversifying Soybean Production Risk Using Maturity Group and Planting Date Choices

2016 ◽  
Vol 108 (5) ◽  
pp. 1917-1929 ◽  
Author(s):  
Wes Weeks ◽  
Michael P. Popp ◽  
Montserrat Salmeron ◽  
Larry C. Purcell ◽  
Edward E. Gbur ◽  
...  
Keyword(s):  
Planting Date ◽  
Maturity Group ◽  
Production Risk ◽  
Soybean Production

scholarly journals Effects of Planting Date for Soybean Growth, Development, and Yield in the Southern USA

Agronomy ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 596
Author(s):  
Nick R. Bateman ◽  
Angus L. Catchot ◽  
Jeff Gore ◽  
Don R. Cook ◽  
Fred R. Musser ◽  
...  
Keyword(s):  
Plant Height ◽  
Field Experiments ◽  
Planting Date ◽  
Yield Potential ◽  
Canopy Closure ◽  
Maturity Group ◽  
Planting Dates ◽  
Southern Us ◽  
Crop Development ◽  
The Impact

As fluctuating commodity prices change the agriculture landscape on a yearly basis, soybean (Glycine max (L.) Merr.) has become the predominant crop in the southern USA, accounting for 65 percent of the total row crop production in the state. To accommodate increased soybean production, planting dates have expanded, spanning from late March through July. To determine the impact of this expanded planting window on soybean development and yield, field experiments were conducted at Starkville and Stoneville, MS, in 2013 and 2014. Treatments included seven planting dates ranging from 25 March to 15 July and two soybean cultivars (one Maturity Group IV and one Maturity Group V cultivar). These studies were conducted in irrigated high––yielding environments. Experimental units were sampled weekly for insect pests and insecticides were applied when populations exceeded the levels at which applications were recommended. Planting date had a significant impact on crop development, plant height, canopy closure, and yield. As planting date was delayed, the time required for crop development decreased from 122 total days for plantings on 25 March to 83 days for plantings on 15 July. For plantings after 2 June, plant height decreased by 1.1 cm per day. Canopy closure decreased by 1.01% per day after 27 May. Soybean yield decreased 26.7 kg/ha per day when soybean was planted after 20 April. This research demonstrates the importance of early planting dates for soybean producers in the southern US to ensure profitability by maximizing yield potential.

Impact of Soybean Planting Date on Soil Population Density of Macrophomina phaseolina

2007 ◽  
Vol 8 (1) ◽  
pp. 13 ◽  
Author(s):  
J. A. Wrather ◽  
J. G. Shannon ◽  
A. Mengistu
Keyword(s):  
Population Density ◽  
Soil Layer ◽  
Macrophomina Phaseolina ◽  
Planting Date ◽  
Soil Samples ◽  
Population Densities ◽  
Maturity Group ◽  
Planting Dates ◽  
Soil Population ◽  
Group 3

A field experiment was conducted during 2000-2003 near Portageville, MO to determine the affects of soybean planting date on the soil population density of Macrophomina phaseolina. The site was planted to cotton the previous 10 years. The planting dates were mid-April, mid-May, and mid-June during 2000-2003, and the cultivars FFR3975 and Asgrow 3834, maturity group 3, were very susceptible to M. phaseolina. Plots were in the same location each year. Soil samples from the top 15-cm soil layer were collected from plots during May 2000-2004 and analyzed for the population density of M. phaseolina. Planting date did not affect the soil population density of M. phaseolina, but the differences in soil population density among years were significant. These results suggest that soybean producers should not be concerned about planting date directly affecting M. phaseolina soil population densities. Accepted for publication 22 May 2007. Published 17 September 2007.

Profitability and Risk Analysis of Soybean Planting Date by Maturity Group

2015 ◽  
Vol 107 (6) ◽  
pp. 2253-2262 ◽  
Author(s):  
Christopher N. Boyer ◽  
Melissa Stefanini ◽  
James A. Larson ◽  
S. Aaron Smith ◽  
Alemu Mengistu ◽  
...  
Keyword(s):  
Risk Analysis ◽  
Planting Date ◽  
Maturity Group
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