Spider Mite (Acari: Tetranychidae) Infestation Foci: Cotton Yield Reduction

1987 ◽  
Vol 16 (3) ◽  
pp. 614-617 ◽  
Author(s):  
L. T. Wilson ◽  
C. H. Pickett ◽  
T. F. Leigh ◽  
J. R. Carey
Keyword(s):  
Spider Mite ◽  
Yield Reduction ◽  
Cotton Yield

Using field hyperspectral data to predict cotton yield reduction after hail damage

2021 ◽  
Vol 190 ◽  
pp. 106400
Author(s):  
Le Wang ◽  
Yang Liu ◽  
Ming Wen ◽  
Minghua Li ◽  
Zhiqiang Dong ◽  
...  
Keyword(s):  
Hyperspectral Data ◽  
Yield Reduction ◽  
Cotton Yield ◽  
Hail Damage

Spotted Spurge (Euphorbia maculata) Interference with Cotton (Gossypium hirsutum)

Weed Science ◽  
1994 ◽  
Vol 42 (4) ◽  
pp. 553-555 ◽  
Author(s):  
Mohammad T. Bararpour ◽  
Ronald E. Talbert ◽  
Robert E. Frans
Keyword(s):  
Linear Relationship ◽  
Dry Weight ◽  
Field Studies ◽  
Yield Reduction ◽  
Cotton Yield ◽  
Seed Cotton ◽  
Percent Reduction ◽  
Cotton Boll ◽  
Positive Linear Relationship ◽  
Seed Cotton Yield

Field studies were conducted from 1988 through 1990 in Fayetteville, AR, to measure competitiveness of spotted spurge in cotton. Population levels were established by transplanting seedlings from other field areas. There was a positive linear relationship between cotton boll numbers and seed cotton yield. Percent reduction in cotton height, leaf area, dry weight, boll numbers, and seed cotton yield increased as spotted spurge densities increased. Seed cotton yield reduction was 47, 57, and 85% for spotted spurge densities of 5, 10, and 50 spotted spurge plants m–1of row.

Cotton (Gossypium hirsutum) Response to Simulated Triclopyr Drift

1991 ◽  
Vol 5 (3) ◽  
pp. 493-498 ◽  
Author(s):  
Charles E. Snipes ◽  
Joe E. Street ◽  
Thomas C. Mueller
Keyword(s):  
Gossypium Hirsutum ◽  
Yield Reduction ◽  
Growth Stages ◽  
Cotton Yield ◽  
Lag Period ◽  
Over The Top

Cotton response to triclopyr was evaluated when it was applied over-the-top at simulated drift rates to pin-head square and early bloom cotton growth stages in 1987 and 1988. The herbicidal effects of triclopyr were most evident after a lag period of 10 to 15 d. Triclopyr at 60 g ai ha-1applied at pin-head square reduced cotton height in 1987, but not in 1988. Triclopyr applied at pin-head square and early bloom reduced cotton flowering initially, as measured by white bloom counts, in both years. Total blooms were reduced in 1987, but not in 1988. Cotton maturity was delayed by triclopyr application during early bloom, as shown by a decrease in percent open bolls, and a decrease in first pick cotton yields. Cotton yield was lower in plots receiving triclopyr, with the greatest yield reduction caused by a 60 g ha-1triclopyr application at early bloom.

The Effect of Harvesting Time and Variety on Fiber andCottonStalkYield Potential and its Companent for Use in the Pulp andPaperIndustry

2016 ◽  
Vol 5 (3) ◽  
pp. 718-728
Author(s):  
Zeinolabedin Akhlaghi Amiri ◽  
Mohammad Reza Dehghani Firouzabadi
Keyword(s):  
Paper Industry ◽  
Raw Material ◽  
Yield Potential ◽  
Yield Reduction ◽  
Cotton Yield ◽  
Cotton Stalk ◽  
Harvesting Time ◽  
The Third ◽  
Potential Gain ◽  
Stalk Yield

Survey of cotton fiber yield, in addition to the identification of its best variety can cause cotton residual enhancement. The remainder of cotton stalk in farms is an illness-causing agent and leads to yield reduction in the next cultivation stage, an event which requires burial. So the usage of cotton stalk in the pulp and paper industry,which faces a shortage of raw material, results in a reduction intillage costs, thus, fiber and stalk yield potential gain importance. In this study, we investigated the effect of variety and harvesting time on cotton yield and its components, which was obtained from experiments of the plot of the 2009 cultivation year. An amount of dry material of each part of the components was also obtained. Experiments on factors containedfive varieties: Sepid, Sahel, Armaghan, Golestan and number200. The harvesting times were also three, namely: 145, 175 and 205 days after cultivation replicated in 4 blocks. Results of the variance analysis showed that the effects of variety and harvesting time on total dry material yields, leaf, stalk, bast and the core, cotton yield, empty and closed boll, stalk height and diameter were significated. The Armaghan variety in the second harvesting time had the highest cotton yield(2413.95) ,whilethe Sepid variety had the most cotton stalk yield in the third harvesting time(3716.76). Except for boll, cotton and total dry material yield, in the other evaluated characteristics, the third harvesting time had the best yield, and the most total dry material yield was related to the second harvesting time.

Zoning of Water Deficiency Risk for Conventional Cotton in Mato Grosso

2019 ◽  
pp. 1-12
Author(s):  
Elizangela Selma da Silva ◽  
José Holanda Campelo Júnior ◽  
Francisco De Almeida Lobo ◽  
Ricardo Santos Silva Amorim
Keyword(s):  
Risk Estimation ◽  
The State ◽  
Yield Reduction ◽  
Agricultural Activity ◽  
Cotton Yield ◽  
Mato Grosso ◽  
Sowing Dates ◽  
The One ◽  
Sowing Period ◽  
Yield Decrease

Cotton agroclimatic zoning is an essential tool to establish the most favorable periods for its cultivation, when the environmental conditions are more propitious, in order to reduce risks in agricultural activity. The objective of this work was to develop the zoning of the risk estimation of cotton yield reduction in the state of Mato Grosso, using the FAO method. Cultivars of early, medium and late cycles were considered, with four sowing dates (12/11, 12/21, 1/01 and 1/11) and three available water capacities (60, 140 and 200 mm). Results were specialized by ordinary kriging. The southernmost regions of the state presented the highest reduction risks, due to the lower precipitation in these areas. Sowing period 1 presented the lowest yield reduction risk, and the late-cycle cultivar in season 4 was the one that presented the highest reduction risk. Trough the validation of the obtained results, it can be considered that the methodology adopted in this work to verify the risk of yield decrease proved to be efficient.

Spider Mite (Acari: Tetranychidae) Infestation Rate and Initiation: Effect on Cotton Yield

1991 ◽  
Vol 84 (2) ◽  
pp. 593-600 ◽  
Author(s):  
L. T. Wilson ◽  
P. J. Trichilo ◽  
D. Gonzalez
Keyword(s):  
Spider Mite ◽  
Infestation Rate ◽  
Cotton Yield

Growth and Interaction of Barnyardgrass (Echinochloa crus-galli) with Cotton (Gossypium hirsutum)

Weed Science ◽  
1991 ◽  
Vol 39 (3) ◽  
pp. 369-375 ◽  
Author(s):  
Paul E. Keeley ◽  
Robert J. Thullen
Keyword(s):  
Gossypium Hirsutum ◽  
Seed Production ◽  
Yield Reduction ◽  
Cotton Yield ◽  
Seed Cotton ◽  
Field Plots

Several weed-free and barnyardgrass competition periods were established and maintained in cotton in field plots to evaluate their influence on cotton yield and seed production of barnyardgrass. When barnyardgrass was sprayed with fluazifop 3, 6, 9, or 12 weeks after cotton emergence, only plots sprayed at 3 weeks yielded as much cotton as plots kept weed free. Barnyardgrass permitted to compete for 6, 9, 12, and 25 weeks reduced cotton yields an average of 21, 59, 90, and 97%, respectively. When barnyardgrass was seeded into weed-free plots at 3, 6, 9, and 12 weeks after cotton emergence, a weed-free period of 9 weeks was required to prevent significant cotton yield reduction. Cotton in plots weed free for 3 and 6 weeks yielded an average of 13 and 87% as much seed cotton, respectively, as weed-free controls. Barnyardgrass produced 15 to 85% as many seeds as weedy check plots in plots weed free for less than 9 weeks and in plots where control was delayed for 9 and 12 weeks. Cotton grades were reduced because of grass in plots weed free for 3 and 6 weeks, and in plots where barnyardgrass competed for 9 and 12 weeks.

Cotton Response to Simulated Drift of Seven Hormonal-Type Herbicides

2007 ◽  
Vol 21 (4) ◽  
pp. 987-992 ◽  
Author(s):  
Molly E. Marple ◽  
Kassim Al-Khatib ◽  
Douglas Shoup ◽  
Dallas E. Peterson ◽  
Mark Claassen
Keyword(s):  
Field Experiments ◽  
Yield Reduction ◽  
Minimal Effect ◽  
Cotton Yield ◽  
Leaf Stage ◽  
Fiber Yield ◽  
Herbicide Treatment ◽  
Flower Abortion ◽  
Early Injury ◽  
Herbicide Use

Field experiments were conducted at Manhattan and Hesston, KS, in 2004, and at Manhattan, KS, in 2005, to evaluate cotton response to seven hormonal-type herbicides. Herbicides 2,4-D amine, 2,4-D ester, clopyralid, picloram, fluroxypyr, triclopyr, and dicamba were each applied at 0, 1/100, 1/200, 1/300, and 1/400 of the herbicide use rates on cotton in the six- to eight-leaf stage. Herbicide use rates were 210 and 280 g ae/ha for fluroxypyr and clopyralid and 561 g ae/ha, for 2,4-D amine, 2,4-D ester, dicamba, picloram, and triclopyr. At 14 d after treatment (DAT), all herbicides caused leaf cupping and epinasty, except triclopyr and clopyralid, which caused severe bleaching and chlorosis. The order of visual injury ratings was 2,4-D ester > 2,4-D amine > picloram > dicamba > fluroxypyr > triclopyr > clopyralid. By 56 DAT, slight injury symptoms were observed on plants treated with all herbicides, except all rates of 2,4-D, from which symptoms were severe. All rates of 2,4-D and the highest rate of picloram caused more than 60% flower abortion. Ranking of fiber yield reduction after herbicide treatment was 2,4-D ester > 2,4-D amine > picloram > fluroxypyr > dicamba > clopyralid > triclopyr. This research demonstrated that cotton is extremely susceptible to simulated drift rates of 2,4-D and picloram, whereas clopyralid and triclopyr caused early injury, with minimal effect on cotton yield.

scholarly journals Yield Reduction Caused by Twospotted Spider Mite Feeding in an Advanced-cycle Strawberry Breeding Population

2002 ◽  
Vol 127 (2) ◽  
pp. 230-237 ◽  
Author(s):  
Douglas B. Walsh ◽  
Frank G. Zalom ◽  
Douglas V. Shaw ◽  
Kirk D. Larson
Keyword(s):  
Spider Mite ◽  
Cultural Practices ◽  
Correlation Coefficients ◽  
Breeding Population ◽  
Yield Reduction ◽  
Path Coefficient ◽  
Short Day ◽  
Effect On Yield ◽  
Two Spotted Spider Mite ◽  
Yield Responses

Forty-eight strawberry (Fragaria ×ananassa Duchesne) or (Fragaria L. sp.) genotypes from the University of California advanced-cycle breeding population were evaluated over 7 years for susceptibility to and tolerance of infestation by two-spotted spider mite (Tetranychus urticae Koch). In pairwise tests, 23 photoperiodically short-day genotypes were compared with the short-day cultivar Chandler, and 23 day-neutral genotypes to the day-neutral cultivar Selva. Feeding by T. urticae resulted in substantial yield reductions regardless of genotype. Yield reduction from feeding by T. urticae averaged 29.9% for short-day and 23% for day-neutral genotypes. Calculation of variance components for day-neutral genotypes determined that none of the variation in yield was explained by the interaction of genotype and T. urticae infestation, whereas 24.4% of the variation in yield for short-day genotypes was explained by the interaction of genotype and T. urticae infestation. Under current strawberry production practices in California there appears to be little potential for breeding direct resistance to T. urticae for day-neutral genotypes. However, some gains in breeding direct T. urticae resistance may be achieved within short-day genotypes. Phenotypic path-coefficient analysis for direct and indirect effects, and simple correlation coefficients of T. urticae feeding determined there were substantial differences between short-day and day-neutral genotypes in their yield responses to T. urticae feeding. For short-day genotypes, the greatest direct effect on yield resulted from T. urticae feeding in June. For day-neutral genotypes, the greatest direct effects resulted from T. urticae feeding in April and May and were probably due to the day-neutral genotype's more complex flowering responses. Several high-yielding cultivars have been developed and released over the 7 years of this study. It appears the new cultivars that were bred for current cultural practices exhibited a consistent plant response for greater yield both in the presence and absence of T. urticae feeding.

Carryover Potential of Pyrithiobac to Rotational Crops on a Mississippi Black Belt Region Clay Soil

1996 ◽  
Vol 10 (1) ◽  
pp. 140-144 ◽  
Author(s):  
Eric P. Webster ◽  
David R. Shaw
Keyword(s):  
Clay Soil ◽  
Field Studies ◽  
Grain Sorghum ◽  
Black Belt ◽  
Yield Reduction ◽  
Cotton Yield ◽  
Soybean Yield ◽  
Black Belt Region

Field studies were conducted on a Black Belt region clay soil to evaluate pyrithiobac injury to cotton and potential carryover to grain sorghum, soybean, and wheat. Pyrithiobac was applied PPI, PRE, POST at pinhead square, or POST at first bloom at rates of 70, 140, or 280 g ai/ha to cotton. Cotton injury was 7% or less at all rates and application timings. Cotton yield was not reduced by any treatment. The PRE application to cotton, averaged over rates, reduced yield of wheat planted in the fall compared to the POST pinhead square application or the nontreated check. Pyrithiobac at 140 g/ha applied PPI to cotton the previous year reduced soybean yield; at all other rates and timings no soybean yield reduction occurred compared to the nontreated check. Pyrithiobac at all rates applied PPI to cotton caused grain sorghum injury the following year. The 280 g/ha PPI application delayed grain sorghum maturity; however, this did not translate into a yield reduction.

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