Maximizing Economic Returns and Minimizing Stem Rot Incidence with Optimum Plant Stands of Peanut in Nicaragua

2010 ◽  
Vol 37 (2) ◽  
pp. 137-143 ◽  
Author(s):  
J. Augusto ◽  
T. B. Brenneman ◽  
J. A. Baldwin ◽  
N. B. Smith
Keyword(s):  
Field Experiments ◽  
Maximum Yield ◽  
Sclerotium Rolfsii ◽  
Disease Spread ◽  
Stem Rot ◽  
Economic Returns ◽  
Plant Populations ◽  
Significant Yield ◽  
Gross Income ◽  
Disease Pressure

Abstract Peanut growers in Nicaragua use high seeding rates, often greatly in excess of the 19.7 seeds/m recommended for growers in Georgia. Significant yield loss to peanut stem rot (caused by Sclerotium rolfsii) often occurs because of rapid disease spread in high density plant stands. It was hypothesized that lower seeding rates would be beneficial, and field experiments were conducted from 2005 to 2006 in Nicaragua to determine the optimum plant stands for stem rot management, peanut yield, and maximum economic returns. The cultivar Georgia Green was planted in twin rows at seven locations with final stands of 4 to 30 plants/m. Paired plots were either treated or not treated with flutolanil to control stem rot. Stem rot incidence consistently increased with higher peanut plant populations in fields with significant levels (>5%) of stem rot. In fields with more than 5% stem rot incidence, peanut yield and gross income adjusted for seed cost were maximized at within row populations of 12 to 13 and 11 plants/m, respectively, when treated with flutolanil to reduce stem rot. When flutolanil was not applied, yield and gross income adjusted for seed cost were maximized at 10 to 11 and 8 to 10 plants/m, respectively. In locations with low stem rot incidence (<5%), maximum yield and gross income adjusted for seed cost were attained at within row populations of 13 and 12 plants/m, respectively. Nicaraguan growers may maximize their economic return by utilizing seeding rates to obtain final stand counts of 8 to 11 plants/m in fields with severe stem rot and 12 plants/m with low disease pressure.

scholarly journals Reaction of Select Peanut (Arachis hypogaea L.) Lines to Southern Stem Rot and Pythium Pod Rot Under Varied Disease Pressure

1989 ◽  
Vol 16 (1) ◽  
pp. 9-14 ◽  
Author(s):  
O. D. Smith ◽  
T. E. Boswell ◽  
W. J. Grichar ◽  
C. E. Simpson
Keyword(s):  
Arachis Hypogaea ◽  
Disease Incidence ◽  
Sclerotium Rolfsii ◽  
Stem Rot ◽  
Resistant Parent ◽  
Breeding Lines ◽  
Arachis Hypogaea L ◽  
Significant Yield ◽  
Considerable Resistance ◽  
Disease Pressure

Abstract Eight breeding lines, three parents, and the cultivar Florunner were compared under two levels of disease pressure induced by Sclerotium rolfsii Sacc., or Pythium myriotylum Drechs. at each of two locations for three years to ascertain the effectiveness of the host plant resistance to each pathogen. Varied disease pressures were created by application of fungicides and supplement of fungal inoculum. Mean Florunner pod yields varied more than 1000 kg/ha as a result of the S. rolfsii treatments but the yields of the resistant TxAG-3 were not affected. Disease incidence, as measured by frequency of S. rolfsii infection sites and diseased pods, was much higher for Florunner than TxAG-3. Breeding lines for which TxAG-3 was a parent sustained significant yield reductions. The disease incidence in these lines was higher than the resistant parent, equal or less than Tamnut 74, their other parent, and less than Florunner. The grades of TxAG-3 and its derivatives were lower than Florunner. Pod rot incidence differed for the P. myriotylum treatments but pod yields were not different. TxAG-3 and Toalson sustained less pod disease than Florunner and Tamnut 74. The percent of diseased pod tissue for one derivative of Toalson was lower than Toalson and TxAG-3, and that of one TxAG-3 derivative was equal to its best parent. The breeding lines varied in reaction to the two diseases and some lines showed considerable resistance to both organisms.

scholarly journals Use of Resistant Cultivars and Reduced Fungicide Programs to Manage Peanut Diseases in Irrigated and Nonirrigated Fields

Plant Disease ◽  
2008 ◽  
Vol 92 (6) ◽  
pp. 896-902 ◽  
Author(s):  
J. E. Woodward ◽  
T. B. Brenneman ◽  
R. C. Kemerait ◽  
N. B. Smith ◽  
A. K. Culbreath ◽  
...  
Keyword(s):  
Leaf Spot ◽  
Field Experiments ◽  
Production Systems ◽  
Sclerotium Rolfsii ◽  
Stem Rot ◽  
Management Systems ◽  
Cercospora Arachidicola ◽  
Spot Intensity ◽  
Economic Returns ◽  
Irrigation Effects

Field experiments were conducted in 2004 and 2005 to evaluate the response of several peanut cultivars to standard and reduced-input fungicide programs under production systems which differed in the duration of crop rotation, disease history within a field, or in the presence or absence of irrigation. Effects on early leaf spot (caused by Cercospora arachidicola), late leaf spot (caused by Cercosporidium personatum), and southern stem rot (caused by Sclerotium rolfsii), pod yields, and economic returns were assessed. Standard fungicide programs were similar for both sets of experiments and included applications of pyraclostrobin, tebuconazole, azoxystrobin, or chlorothalonil. Reduced-fungicide programs, comprising combinations of the aforementioned fungicides, resulted in two and four applications for the cultivar and irrigation experiment, respectively. Two additional programs (a seven-spray chlorothalonil and a nontreated control) were included in the cultivar experiment. Fungicide programs provided adequate levels of leaf spot suppression, and stem rot incidence was similar among fungicide programs within the two management systems. In the cultivar experiment, returns were significantly lower for the reduced program compared with the full program and seven-spray chlorothalonil program; however, they were significantly higher than the nontreated control. Significant differences in leaf spot, stem rot, and yield were observed among cultivars in both experiments. Overall, leaf spot intensity was lowest for the cvs. Georgia-03L and Georgia-01R and greatest for Georgia Green and Georgia-02C. Georgia-03L, Georgia-02C, and AP-3 consistently had lower incidence of stem rot than the other cultivars. Pod yields for all cultivars were equivalent to or greater than Georgia Green in both experiments; however, the performance of reduced-fungicide programs was inconsistent.

Effect of fertility level on the yield of some native perennial grasses on the North-West Slopes, New South Wales.

1979 ◽  
Vol 1 (4) ◽  
pp. 327 ◽  
Author(s):  
GM Lodge
Keyword(s):  
Field Experiments ◽  
Maximum Yield ◽  
Perennial Grasses ◽  
Fertility Level ◽  
Native Grasses ◽  
North West ◽  
The North ◽  
South Wales ◽  
Significant Yield ◽  
Pot Culture

The effect of fertility on the yields of native perennial grasses was investigated in pot culture and field experiments. Yields of six native perennial grasses and Paspalum dilatatum Poir were determined in the glasshouse at five levels of applied phosphorus (P), sulphur (S) and nitrogen (N) and in the field the biomass of individual tussocks of eight native grasses was compared. In pot culture the maximum yields of the native perennial grasses with P, S and N applied were 15 to 75% lower than those of P. dilatatum. Within the native grasses there were significant yield differences: Bothriochloa macra (Steud) S.T. Blake, Chloris truncata R.Br. and Dichanthium sericeum (R. Br.) Camus yielded up to twice as much dry matter as either Aristida ramosa R.Br., Sporobolus elongatus R.Br. or Eragrostis leptostachya Steud. These data indicate that P, S and N are all essential for maximum yield of some native grasses, and large imbalances in the level of these nutrients resulted in seedling mortalities in most native grasses.

Planting row arrangement and nutrient management in geranium (Pelargonium graveolens) -garlic (Allium sativum) intercropping

2015 ◽  
Vol 49 (5) ◽  
Author(s):  
Santosh Singh
Keyword(s):  
Field Experiments ◽  
Maximum Yield ◽  
Cropping System ◽  
Fold Increase ◽  
Oil Yield ◽  
Cost Ratio ◽  
Economic Returns ◽  
Single Row ◽  
Equivalent Ratio ◽  
Planting Method

Field experiments were carried out at Lucknow, India to evaluate the optimum plant row arrangement of geranium and to study the effects of different rates of fertilizer N, P and Zn for the yield assessment in a geranium-garlic intercropping system. A paired row arrangement (40/80 cm) of geranium planting significantly increased the herb and essential oil yield over the conventional single row planting method (60x30cm). The former gave 20.6 % more herbage than the geranium single row intercrop system, with a 22.3 % increase in oil yield. Application of N at 160 kg ha<sup>−1</sup> significantly increased the herb and oil yields of geranium and bulb yield of garlic over the control and 80 kg N ha<sup>−1</sup>. Uptake of N by geranium was also significantly higher at 160 kg N ha<sup>−1</sup>. Application of phosphorus at 40 kg P<sub>2</sub>O<sub>5</sub> ha<sup>−1</sup> proved significantly better than the no P control in the production of geranium oil and garlic bulbs. Uptake of Zn increased significantly up to 40 kg P<sub>2</sub>O<sub>5</sub> ha<sup>−1</sup>. Higher rates of P decreased the Zn uptake by the plants. Application of 30kg ZnSO<sub>4</sub>ha<sup>−1</sup> showed a significant response on the herb and oil yields over the no zinc control. The higher growth indices such as monetary equivalent ratio (1.45), area time equivalent ratio (1.44), land use efficiency (144 %) and benefit cost ratio (6.37) were recorded with a geranium paired intercrop system compared to other cropping systems. The geranium paired intercrop system proved advantageous in enhancing the economic returns by 1.73 – a two fold increase over the geranium single row, sole cropping system. It is concluded from this study that intercropping of garlic with a geranium paired row system proved highly beneficial in terms of getting higher economic returns by almost a factor of two over the conventional geranium single row planting method. A fertilizer addition of 160 kg N, 40 kg P<sub>2</sub>O<sub>5</sub> and 30 kg Zn SO<sub>4</sub> ha<sup>−1</sup> is recommended for achieving the maximum yield advantages in a geranium-garlic intercropping system.

scholarly journals Suppression of Sclerotinia Stem Rot of Soybean by Lactofen Herbicide Treatment

1999 ◽  
Vol 89 (7) ◽  
pp. 598-602 ◽  
Author(s):  
E. K. Dann ◽  
B. W. Diers ◽  
R. Hammerschmidt
Keyword(s):  
Disease Severity ◽  
Field Experiments ◽  
Lesion Size ◽  
Stem Rot ◽  
Growth Stages ◽  
Sclerotinia Stem Rot ◽  
High Disease Severity ◽  
Disease Pressure ◽  
Seed Yields ◽  
Field Plots

Severity of Sclerotinia stem rot of soybean after treatment with lactofen (Cobra) and other herbicides was assessed in field experiments conducted in Michigan from 1995 to 1997. At sites where disease pressure was high, disease severity was reduced 40 to 60% compared with controls when lactofen was applied at the V3 (1995 and 1996) or R1 (1997) growth stages. Corresponding seed yields were unchanged or up to 20% greater when lactofen was applied at the R1 stage in 1997. Disease severity was not reduced by lactofen treatments in years and at sites where disease pressure was low to medium, and corresponding yields often were reduced by ≈10%. High levels of glyceollin accumulated in lactofen-injured leaves collected from field plots in 1996 and 1997. High glyceollin content in lactofen-treated leaves was associated with significant reductions in lesion size when leaves were challenge-inoculated with Sclerotinia sclerotiorum.

scholarly journals Disease and Yield Response of a Stem-rot-resistant and -Susceptible Peanut Cultivar under Varying Fungicide Inputs

Plant Disease ◽  
2019 ◽  
Vol 103 (11) ◽  
pp. 2781-2785
Author(s):  
J. R. Standish ◽  
A. K. Culbreath ◽  
W. D. Branch ◽  
T. B. Brenneman
Keyword(s):  
Leaf Spot ◽  
Field Experiments ◽  
Sclerotium Rolfsii ◽  
Stem Rot ◽  
Yield Response ◽  
Net Return ◽  
Resistant Cultivars ◽  
Arachis Hypogaea L ◽  
Commercial Fungicide ◽  
Similar Yield

Peanut (Arachis hypogaea L.) producers rely on costly fungicide programs to manage stem rot, caused by Sclerotium rolfsii. Planting disease-resistant cultivars could increase profits by allowing for the deployment of less-expensive, lower-input fungicide programs. Field experiments were conducted to characterize stem rot and early and late leaf spot (caused by Passalora arachidicola and Nothopassalora personata, respectively), yield, and overall profitability of cultivars Georgia-06G (stem-rot-susceptible) and Georgia-12Y (stem-rot-resistant) as influenced by seven commercial fungicide programs. Stem rot incidence was consistently lower on Georgia-12Y for all fungicides when compared with Georgia-06G and was lowest for both cultivars in plots treated with prothioconazole plus a tank mixture of penthiopyrad and tebuconazole. Leaf spot severity was similar for both the resistant and susceptible cultivars, and the greatest reduction occurred in plots treated with prothioconazole plus a tank mixture of penthiopyrad and tebuconazole. Fungicide programs gave similar yield and net return on Georgia-12Y; however, plots of Georgia-06G treated with prothioconazole plus a tank mixture of penthiopyrad and tebuconazole had the greatest yield and net return. Yields and economic return from the highest level of fungicide inputs on Georgia-06G were numerically less than those of Georgia-12Y treated with only chlorothalonil. These results show the value of fungicides in peanut disease management with susceptible cultivars, as well as the benefits of planting stem-rot-resistant cultivars in high-risk situations.

scholarly journals Effects of Row Pattern, Seeding Rate, and Inoculation Date on Fungicide Efficacy and Development of Peanut Stem Rot

Plant Disease ◽  
2007 ◽  
Vol 91 (3) ◽  
pp. 273-278 ◽  
Author(s):  
L. E. Sconyers ◽  
T. B. Brenneman ◽  
K. L. Stevenson ◽  
B. G. Mullinix
Keyword(s):  
Disease Incidence ◽  
Sclerotium Rolfsii ◽  
Critical Factor ◽  
Field Studies ◽  
Stem Rot ◽  
Relative Efficacy ◽  
Seeding Rate ◽  
Plant Populations ◽  
Fungicide Efficacy ◽  
Infested Field

Two field studies were conducted in 2000, 2001, and 2002 to determine the effects of row pattern (91.4-cm single or 20.3-cm twin) and seeding rate (single: 12.5, 17.4, or 22.6 seed m-1or twin: 6.2, 8.9, or 11.5 seed m-1) on peanut stem rot (Sclerotium rolfsii) development. The first study was conducted in a naturally infested field and relative efficacy of azoxystrobin (Abound 2.08 F, applied at a rate of 0.3 kg a.i. ha-1 at 60 and 90 days after planting [DAP]) also was evaluated. In this study, stem rot incidence was significantly greater (P < 0.05) in single rows planted at high seeding rates than in twin rows planted at any of the seeding rates. Row pattern did not affect azoxystrobin efficacy, and disease incidence was nearly half as much in twin rows treated with fungicide than incidence in single rows treated with fungicide. In the second field study, individual peanut plants in fumigated plots were inoculated once with S. rolfsii at 50, 70, or 90 DAP. Stem rot incidence at harvest was significantly greater on plants inoculated 50 DAP than plants inoculated 70 or 90 DAP. The incidence of spread to adjacent rows was higher in plots where plants were inoculated at 50 than at 90 DAP. Plants inoculated 90 DAP had less disease at harvest, but often developed more severe symptoms within the first week after inoculation compared with plants inoculated 50 or 70 DAP. Symptoms were more severe in single than in twin rows, and at the higher seeding rates. Data from these studies suggest that the physical spacing between plants is a critical factor in stem rot development both on individual plants and in plant populations.

Evaluation of Trichoderma spp., Fungicides, and Chemical Combinations for Control of Southern Stem Rot on Peanuts1

1983 ◽  
Vol 10 (2) ◽  
pp. 75-79 ◽  
Author(s):  
A. S. Csinos ◽  
D. K. Bell ◽  
N. A. Minton ◽  
H. D. Wells
Keyword(s):  
Field Experiments ◽  
Sclerotium Rolfsii ◽  
Stem Rot ◽  
Average Increase ◽  
Trichoderma Spp ◽  
Trichoderma Sp ◽  
High Incidence ◽  
Wheat Middlings ◽  
History Of ◽  
Disease Loci

Abstract Field experiments evaluating three isolates of Trichoderma harzianum Rifai and a white spored Trichoderma sp. alone and in combination with fungicides and fungicide-insecticide/nematicide combinations were conducted during 1979-81 in an area with a history of high incidence of Sclerotium rolfsii Sacc. None of the Trichoderma sp. treatments alone, mixed with wheat middlings, or combined with carboxin reduced disease or increased yield over the control; however, disease was reduced when T. harzianum was applied with PCNB at 11.2 kg/ha. Trichoderma spp. appeared to be active only over a 3-8 day period, which was inadequate for control of S. rolfsii for the entire season. Treatments containing PCNB (11.2 kg ai/ha) alone or with the insecticide/ nematicides ethoprop (3.4 kg ai/ha), fensulfothion (3.4 kg ai/ha), and aldicarb (1.7 kg ai/ha) significantly increased yields 9 of 12 times with an average increase of 790 kg/ha; and significantly reduced disease loci at harvest 5 of 12 times with an average reduction of 36%. Ethoprop 10G alone at 3.4 kg ai/ha increased yield one of 3 times, but did not reduce disease. Aldicarb and phenamiphos alone did not decrease disease or increase yield. Carboxin 4G decreased disease and increased yield only when applied at 1.12 kg ai/ha six times on an as required basis. Carboxin 3F at 0.84 kg ai/ha applied 6 times and carboxin 75W at 1.27 kg ai/ha applied one time did not increase yield or reduce disease at harvest.

Response of Peanut Cultivars to Full and Reduced Spray Programs of Tebuconazole for Control of Southern Stem Rot1

2001 ◽  
Vol 28 (1) ◽  
pp. 5-8 ◽  
Author(s):  
B. A. Besler ◽  
W. J. Grichar ◽  
O. D. Smith ◽  
A. J. Jaks
Keyword(s):  
Disease Incidence ◽  
Sclerotium Rolfsii ◽  
Stem Rot ◽  
Yield Response ◽  
Moderate Disease ◽  
Peanut Cultivars ◽  
Disease Pressure

Abstract Eleven commercially grown peanut cultivars were evaluated for disease and yield response to two and four applications of tebuconazole under moderate disease pressure (&lt; 12 hits/12.2 m) by southern stem rot (Sclerotium rolfsii). The incidence of southern stem rot was reduced in all cultivars when treated with two and four sprays of tebuconazole. Tamrun 96 and Southwest Runner had the lowest disease incidence. Cultivars responded with higher yields when sprayed with two and four applications of tebuconazole compared to the unsprayed plots. Peanut grade (SMK + SS) was not affected by tebuconazole. Georgia Runner and Tamrun 96 produced the highest grade while Southwest Runner was the lowest.

Peanut Disease Management Utilizing an Infurrow Treatment of Azoxystrobin

2002 ◽  
Vol 3 (1) ◽  
pp. 6 ◽  
Author(s):  
Steve L. Rideout ◽  
Timothy B. Brenneman ◽  
Albert K. Culbreath
Keyword(s):  
Disease Control ◽  
Sclerotium Rolfsii ◽  
Crown Rot ◽  
Stem Rot ◽  
Minimal Impact ◽  
Adverse Conditions ◽  
Tomato Spotted Wilt ◽  
Growing Conditions ◽  
High Quality Seed ◽  
Disease Pressure

Applications of azoxystrobin in-furrow have shown inconsistent results in terms of yield and disease control in experimental peanut plots. Two trials were conducted in both 2000 and 2001 to better define the effects of this treatment on peanut disease control and pod yield. Treatments included: azoxystrobin in-furrow alone (102 g ai/ha), azoxystrobin mid-season alone (two applications at 335 g ai/ha), azoxystrobin both in-furrow and mid-season, and a nontreated control. Destructive sampling was conducted throughout the growing season to determine treatment effects. The in-furrow treatment of azoxystrobin had minimal impact on plant stand counts, tomato spotted wilt incidence, yield, and crop value. However, in-furrow applications of azoxystrobin did suppress levels of Aspergillus crown rot (Aspergillus niger) and early season (prior to 60 days after planting) southern stem rot (Sclerotium rolfsii). However, season-long control of stem rot was only accomplished through the use of mid-season applications of azoxystrobin. Similarly, yields and crop value were only significantly increased when in-season applications of azoxystrobin were made. These trials were conducted under optimal planting and growing conditions using high quality seed. Testing under adverse conditions or heavier disease pressure, which may reveal more benefits from a treatment of azoxystrobin in-furrow, needs to be conducted. Accepted for publication 13 August 2002. Published 16 September 2002.

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