scholarly journals Control of Dichelops melacanthus with insecticides associated with sulphur applied in different times in corn

2017 ◽  
Vol 10 (1) ◽  
pp. 67
Author(s):  
J. C. Guerreiro ◽  
G. B. Silva ◽  
A. P. Azevedo ◽  
R. R. Espessato ◽  
A. T. Padovan ◽  
...  
Keyword(s):  
Experimental Design ◽  
Analysis Of Variance ◽  
Initial Phase ◽  
Stink Bug ◽  
Stink Bugs ◽  
F Test ◽  
Visual Evaluation ◽  
Corn Crop ◽  
Important Pest

The stink bug Dichelops melacanthus has become an important pest for corn crop and it has been causing several losses even in the initial phase of the crop. The objective of the experiment was the evaluation of effectiveness of the insecticides on the control of D. melacanthus in corn by adding of sulfur or not, in different control times. In order to evaluate the effect of the insecticide by adding or not sulfur on the control of D. melacanthus, 17 treatments with 4 different insecticides (with and without sulfur, in two different control times plus control) were used to get the results. The experimental design used was the randomized blocks, with four repetitions. The evaluation of effectiveness on stink bugs control was gotten by visual evaluation of the symptoms at 6, 13 and 20 days after emergence (DAE). Analysis of variance by F test (Anova) was done and the averages compared through Scott-knott test (p≤0,05). The pulverization of insecticides was more effective when it was done 4 (DAE), reducing the symptoms and injuries occasioned by the stink bug D. melacanthus and the mortality of damaged plants. The insecticide bifentrina+carbosulfano showed the higher effectiveness on stink bug control. To conclude, the use of sulfur associated to insecticides did not present a significant effect.

scholarly journals Oviposition preference of the neotropical brown stink bug Euschistus heros on artificial substrates of different colors

2013 ◽  
Vol 43 (12) ◽  
pp. 2185-2190
Author(s):  
Diones Krinski ◽  
Bruna Magda Favetti ◽  
Adielson Gonçalves de Lima ◽  
Tatiane Regina Brum
Keyword(s):  
Analysis Of Variance ◽  
Oviposition Preference ◽  
Artificial Substrates ◽  
Choice Test ◽  
Stink Bug ◽  
Stink Bugs ◽  
Design Data ◽  
Randomized Design ◽  
Euschistus Heros ◽  
Completely Randomized Design

This study aimed to evaluate the oviposition preference of the Neotropical brown stink bug, Euschistus heros (F.) on artificial substrates of different colors (felt woven). For this, ten pairs of stink bugs were transferred into plastic pots. Each pot contained seven felts of 6x20 cm (100% polyester-atoxic) of different colors (white, black, blue, green, red, yellow and brown). The pots were evaluated daily for three weeks (21 days) being counted the number of eggs, clutches and eggs per clutch for each color of felt. The choice test was set in a completely randomized design. Data obtained was submitted to the analysis of variance and means were compared by Scott-Knott test at 5% probability. During the evaluation were produced 7074 eggs distributed in 977 clutches, accounting a mean of 7.06±0.67 eggs per clutch. Results indicated that females laid a significantly greater number of eggs (2380 and 1686) and a greater number of clutches (319 and 233) on the yellow and white felts, respectively, than on the remaining substrates. The substrates in color red, black and brown were the least preferred, and the colors blue and green were intermediate when compared with others. Therefore, the substrates colored yellow and white are suggested to be used in rearing E. heros in the laboratory.

scholarly journals Bioactivator on physiological performance of tomato and onion seeds

2018 ◽  
Vol 9 (1) ◽  
pp. 19-25
Author(s):  
Lilian Madruga Tunes ◽  
Andréia Da Silva Almeida ◽  
Géri Eduardo Meneghello ◽  
Francisco Amaral Villela ◽  
Vanessa Nogueira Soares ◽  
...  
Keyword(s):  
Experimental Design ◽  
Orthogonal Polynomials ◽  
Analysis Of Variance ◽  
Environmental Conditions ◽  
Accelerated Aging ◽  
Cold Test ◽  
Germination Percentage ◽  
Maximum Efficiency ◽  
F Test ◽  
Physiological Performance

Vegetable seeds have high commercial value, in the field after sowed seeds were exposed to unfavorable environmental conditions capable of causing reductions in the yield. Thiamethoxam is a bio-activator that may confer tolerance to stresses. In this regard, we aimed to evaluate the influence of thiamethoxam in the physiological performance of four lots of tomato and onion seeds. Seeds were treated with five doses of thiamethoxam, 0.0; 0.2; 0.4; 0.6 and 0.8 ml of product per 1000 seeds. The effects of the seed treatments were evaluated by the assessments of the first count of germination, sprouting test, cold test, accelerated aging and seedling`s emergence in the greenhouse. The experimental design was completely randomized, with four replicates per lot and by species. Data were submitted to analysis of variance and adjusted by orthogonal polynomials, using the adjusting equation based on the significance of F test at 5% probability. The bioactivator provided an increase in germination percentage, the first count of ermination, germination after accelerated aging, cold test and seedling’s emergence for low vigor seed lots. The bioactivator thiamethoxam stimulates the physiological performance of tomato and onion seeds. Doses of 0.5 to 0.6 mL of thiamethoxam per 1000 seeds of tomato and onion correspond to technical maximum efficiency.

scholarly journals PRODUÇÃO E MATÉRIA SECA DO INHAME FERTIRRIGADO COM BIOFERTILIZANTE

Irriga ◽  
2021 ◽  
Vol 1 (4) ◽  
pp. 748-753
Author(s):  
Edimir Xavier Leal Ferraz ◽  
Raquele Mendes de Lira ◽  
Antônio Henrique Cardoso do Nascimento ◽  
Isaac Lima Simões De Vasconcelos ◽  
Roberto Elias Dos Santos ◽  
...  
Keyword(s):  
Experimental Design ◽  
Analysis Of Variance ◽  
Dry Matter ◽  
Polynomial Regression ◽  
F Test ◽  
Average Production ◽  
Different Doses

PRODUÇÃO E MATÉRIA SECA DO INHAME FERTIRRIGADO COM BIOFERTILIZANTE     EDIMIR XAVIER LEAL FERRAZ1; RAQUELE MENDES DE LIRA1; ANTONIO HENRIQUE CARDOSO DO NASCIMENTO2; ISAAC LIMA SIMÕES DE VASCONCELOS1; ROBERTO ELIAS DOS SANTOS1 E IRLÂNDIO DE SÁ SANTANA1   1 Departamento de Agronomia, Universidade Federal Rural de Pernambuco (UFRPE-UAST), Av. Gregório Ferraz Nogueira, s/n, CEP 56909-535, Serra Talhada, Pernambuco, Brasil. 2 Departamento de Zootecnia, Universidade Federal Rural de Pernambuco (UFRPE-UAST), Av. Gregório Ferraz Nogueira, s/n, CEP 56909-535, Serra Talhada, Pernambuco, Brasil.     1 RESUMO   Objetivou-se avaliar a influência da aplicação de diferentes doses de biofertilizante via fertirrigação, sobre a produção e acúmulo de matéria seca de rizomas de inhame. O delineamento experimental utilizado foi em blocos casualizados, com cinco tratamentos e quatro repetições. Os tratamentos foram compostos por cinco doses de biofertilizante (D1 = 0 ml planta-1; D2 = 30 ml planta-1; D3 = 60 ml planta-1; D4 = 90 ml planta-1; D5 = 120 ml planta-1). Aos 210 dias após o plantio realizou-se a colheita e através de pesagem com balança de precisão avaliou-se a produção e a matéria seca dos rizomas de inhame. Esses dados foram submetidos a análise de variância pelo teste F a 1 e 5%, e regressão polinomial. Constatou-se que o aumento das doses de biofertilizantes aplicado via fertirrigação possibilitou incremento na produção e matéria seca, mas com valores inferiores à média produtiva.   Palavras chaves: Dioscorea cayennensis Lam., Fertilidade, Irrigação.     FERRAZ, E.X.L.; LIRA, R.M.; NASCIMENTO, A.H.C; VASCONCELOS, I.L.S.; SANTOS, R. E.; SANTANA, I.S. YAM PRODUCTION AND DRY MATTER FERTILIZED WITH BIOFERTILIZER     2 ABSTRACT   This study aimed to evaluate the influence of the application of different doses of biofertilizer via fertigation on the production and accumulation of dry matter of yam rhizomes. The experimental design used was in a randomized block, with five treatments and four replications. The treatments consisted of five doses of biofertilizer (D1 = 0 ml. plant-1; D2 = 30 ml plant-1; D3 = 60 ml plant-1; D4 = 90 ml plant-1; D5 = 120 ml plant-1). At 210 days after planting, the harvest was carried out and, by weighing with a precision scale, the production and dry matter of the rhizomes of yam were evaluated. These data were submitted to analysis of variance by the F test at 1 and 5%, and polynomial regression. It was found that the increase in the doses of biofertilizers applied via fertigation allowed an increase in production and dry matter, but with values below the average production.   Keywords: Dioscorea cayennensis Lam., Fertility, Irrigation. 

Stink Bugs in Florida Rice

EDIS ◽  
2013 ◽  
Vol 2013 (11) ◽  
Author(s):  
Ron Cherry
Keyword(s):  
United States ◽  
Dominant Species ◽  
The United States ◽  
Rice Production ◽  
Rice Fields ◽  
Stink Bug ◽  
Stink Bugs ◽  
First Report ◽  
Important Pest ◽  
Species Being

Although many different insects can be found in rice fields in Florida, stink bugs are currently considered the most important pest. Jones and Cherry reported that the rice stink bug was the dominant species, comprising more than 95% of the total stink bug population. Cherry et al. (1998) reported that the stink bug Oebalus ypsilongriseus was widespread in Florida rice fields. This was the first report of this species being found in commercial rice fields in the United States. Cherry and Nuessly (2010) reported that the stink bug Oebalus insularis is now widespread in Florida rice fields. This was the first report of this species being found in commercial rice fields in the United States. The stink bug complex attacking Florida rice is the most diversified and unique stink bug complex in US rice production. This 4-page fact sheet was written by Ron Cherry, and published by the UF Department of Entomology and Nematology, October 2013. http://edis.ifas.ufl.edu/in1009

scholarly journals Inhibitory Copulation Effect of Vibrational Rival Female Signals of Three Stink Bug Species as a Tool for Mating Disruption

Insects ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 177
Author(s):  
Aline Moreira Dias ◽  
Miguel Borges ◽  
Maria Carolina Blassioli Moraes ◽  
Matheus Lorran Figueira Coelho ◽  
Andrej Čokl ◽  
...  
Keyword(s):  
Pest Management ◽  
Mating Behavior ◽  
Mating Disruption ◽  
Management Strategies ◽  
Stink Bug ◽  
Stink Bugs ◽  
Vibratory Communication ◽  
Communication Signals ◽  
Long Duration ◽  
Bean Plants

Stink bugs are major pests in diverse crops around the world. Pest management strategies based on insect behavioral manipulation could help to develop biorational management strategies of stink bugs. Insect mating disruption using vibratory signals is an approach with high potential for pest management. The objective of this work was to investigate the effect of conspecific female rival signals on the mating behavior and copulation of three stink bug species to establish their potential for mating disruption. Previously recorded female rival signals were played back to bean plants where pairs of the Neotropical brown stink bug, Euschistus heros, and two green stink bugs, Chinavia ubica and Chinavia impicticornis were placed. Vibratory communication and mating behavior were recorded for each pair throughout the experimental time (20 min). Female rival signals show a disrupting effect on the reproductive behavior of three conspecific investigated stink bug species. This effect was more clearly expressed in E. heros and C. ubica than in C. impicticornis. The likelihood of copulating in pairs placed on control plants, without rival signals, increased 29.41 times in E. heros, 4.6 times in C. ubica and 1.71 times in C. impicticornis. However, in the last case, the effect of female rivalry signals in copulation was not significant. The effect of mating disruption of female rival signals of the three stink bug species may originate from the observed reduction in specific vibratory communication signals emitted, which influences the duet formation and further development of different phases of mating behavior. Our results suggest that female rival signals have potential for application in manipulation and disruption of mating behavior of stink bugs. Further work needs to focus on the effects of female rival signals used in long duration experiments and also their interactions with chemical communication of stink bugs.

scholarly journals Pliocene Model Intercomparison Project (PlioMIP): experimental design and boundary conditions (Experiment 2)

2011 ◽  
Vol 4 (3) ◽  
pp. 571-577 ◽  
Author(s):  
A. M. Haywood ◽  
H. J. Dowsett ◽  
M. M. Robinson ◽  
D. K. Stoll ◽  
A. M. Dolan ◽  
...  
Keyword(s):  
Experimental Design ◽  
Boundary Conditions ◽  
Initial Phase ◽  
Climate Models ◽  
Model Development ◽  
Warm Period ◽  
Model Intercomparison ◽  
Ocean Atmosphere ◽  
Intercomparison Project ◽  
Fully Coupled

Abstract. The Palaeoclimate Modelling Intercomparison Project has expanded to include a model intercomparison for the mid-Pliocene warm period (3.29 to 2.97 million yr ago). This project is referred to as PlioMIP (the Pliocene Model Intercomparison Project). Two experiments have been agreed upon and together compose the initial phase of PlioMIP. The first (Experiment 1) is being performed with atmosphere-only climate models. The second (Experiment 2) utilises fully coupled ocean-atmosphere climate models. Following on from the publication of the experimental design and boundary conditions for Experiment 1 in Geoscientific Model Development, this paper provides the necessary description of differences and/or additions to the experimental design for Experiment 2.

scholarly journals Tolerance of Annual Winter Species to Protoporfirinogen Oxidase Inhibiting Herbicides (Protox)

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
C. ALVES ◽  
L. GALON ◽  
R.R. KAIZER ◽  
F.L. WINTER ◽  
C.M. HOLZ ◽  
...  
Keyword(s):  
Leaf Area ◽  
Plant Species ◽  
Analysis Of Variance ◽  
Dry Matter ◽  
Stem Diameter ◽  
F Test ◽  
Tolerant Species ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Linear Regressions

ABSTRACT: The use of plant species for the phytoremediation of soils contaminated with herbicides is an alternative that has been emphasized to minimize the effects of the persistence of agrochemicals in the environment. The objective of this study was to evaluate the tolerance potential of winter species in soils contaminated with sulfentrazone and fomesafen. The experiment was in a completely randomized design with four replications. Doses of fomesafen (0.0, 0.125, 0.250, and 0.5 kg ha-1) and sulfentrazone (0.0, 0.3, 0.6 and 1.2 kg ha-1) were applied during the pre-emergence of phytoremediate species (black oat, vetch, birdsfood trefoil, radish and lupin). Forty five days after the emergence of the species, the phytotoxicity (%), leaf area (cm2), stalk and/or stem diameter (mm), height (cm) and dry matter (g) variables of the plants were evaluated. Data were submitted to analysis of variance by F test; when significant, linear or non linear regressions were applied to evaluate the effect of herbicide doses on the studied species. Birdsfood trefoil was the less tolerant species to fomesafen and sulfentrazone. Black oat was less affected by the application of fomesafen doses, but it was highly susceptible to sulfentrazone. Radish presented tolerance only up to the fomesafen dose of 0.25 kg ha-1; as for sulfentrazone, the species showed tolerance. The most tolerant species to fomesafen and sulfentrazone, regardless of the dose, was the lupine, which is a possible alternative for the phytoremediation of soils contaminated with these herbicides.

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