Tank mixture of pesticides and foliar fertilizers for Triozoida limbata control in guava trees (Psidium guajava L.)

Zandonadi, César Henrique Souza; Alves, Thales Cassemiro; Assunção, Heli Heros Teodoro de; Alves, Guilherme Sousa; Silva, Sérgio Macedo; Cunha, João Paulo Arantes Rodrigues da

doi:10.1590/0034-737x201966040008

Cited by 3 publications

(3 citation statements)

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“…They were placed between rows in the middle of the plot. After application, the dishes were collected and stored in a thermal box for further laboratory analysis, as performed by Zandonadi et al (2019).…”

Section: Experiments Was Carried Out At the Capim Brancomentioning

confidence: 99%

Electrostatic Spraying Effect on Spray Deposition and Powdery Mildew Control in Soybean

et al. 2019

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Electrostatic spray can bring benefits to the pesticide application such as the reduction of application rate and the increase of deposits on targets. Therefore, this study aimed to evaluate the effect of electrostatic spraying using lower application rates and different adjuvants on soybean spray deposition and chemical control of powdery mildew (Microsphaera diffusa Cooke & Peck). The field experiment was conducted in duplicate. A randomized complete block design with four replications in a 2 × 2 × 2 + 1 factorial scheme was used. The factors were two application rates, with and without droplet electrification, two spray solution compositions, and one additional treatment. Deposition on upper and lower leaves, spray loss to the soil, and powdery mildew control effectiveness were evaluated. The electrical conductivity of the spray solution and the charge/mass ratio induced in droplets were also evaluated. All treatments reduced the soybean powdery mildew severity. Electrostatic spraying responded positively to an increase in the electrical conductivity of the spray solution regarding the charge/mass ratio, but it did not increase spray deposition on the lower third of the canopy and did not influence spray loss to the soil, which was higher as the application rate increased.

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Section: Experiments Was Carried Out At the Capim Brancomentioning

confidence: 99%

Electrostatic Spraying Effect on Spray Deposition and Powdery Mildew Control in Soybean

et al. 2019

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“…In this context, the importance of using fertilizers with highperformance rises (Fageria;Morais;Santos, 2010. ) During field application, foliar fertilizers are usually mixed with pesticides and pulverized on the crops (Zandonadi et al, 2019). However, incompatibility between these two components leads to decreased fertilizer solubility, causing clogging of the spray nozzles.…”

Section: Introductionmentioning

confidence: 99%

Enhanced solubility of foliar fertilizer via spray dryer: Process analysis and productivity optimization by response surface methodology

et al. 2022

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Foliar fertilization is a highly efficient technique of applying needed plant nutrients. During pulverization in the field, the incompatibility between fertilizer and pesticides can cause clogging of the spray nozzles. So, this work aims to improve the solubility of foliar fertilizers to facilitate its application. The effect of airflow, inlet gas temperature, and feed solution flow rate over yield, productivity, solubility, and final moisture were evaluated. The powder solubility was improved because of the capillary effect caused by greater porosity, roughness, and particle agglomeration. The maximum productivity of 0.336 kg/h was obtained at 175 ºC, with a liquid feed of 0.82 L/h and an airflow rate of 1.95 m3/min.

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“…The guava plants attacked by T. limbata lose productivity up to 55% due to deformations in leaves and losses of leaf photosynthetic area [20]. To control the damages in the leaves and decrease the economic losses the guava producers apply pesticides each 15 to 20 days [21] with up to 600L/ha of pesticide, mainly imidacloprid, a neonicotinoid [22,23] which is not ecologically desirable for the health of the plantation workers nor the health environment.…”

Section: Introductionmentioning

confidence: 99%

The Psyllids Triozoida Limbata Supplant the Defenses of Psidium Guajava Plants to Garentee Feeding and Protection

Picanço

Carmo

Azevedo

et al. 2020

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Background: Herbivores cause biochemical, physiological, and morphological changes on plants. The ultimate effects of the herbivore activities are damages on the plant's body that can lead from local tissues death to the plant death. The intensity of herbivore attack and the plant's capability to defend itself determine the outcomes of herbivory. When the plant under attack has economic importance, such damages can diminish the productivity of the plantation and compromise the economy of families and the local communities. Although the adverse effects of herbivory on plants and economy are entirely known, some biological mechanisms underlying these damages remain unclear, especially at the anatomical and hormonal levels. The psyllid Triozoida limbata (Hemiptera: Triozidae) is a critical guava (Psidium guajava) pest in the Neotropical region, causing productivity plantation losses up to 55%. Psyllids cause visible morphological changes on guava leaves; however, there is a lack of detailed studied of the cellular, anatomical, and hormonal aspects of the subject. Thus, this work aimed to determine the alterations caused in guava leaves by T. limbata through anatomical and hormonal analyzes. Results: We found that the psyllid's nymphs feeding causes cells hypertrophy and hyperplasia determining the formation of the leaf-roll galls. Although there was no anatomical differentiation of the mesophilic tissues, the cells accumulate starch. Along with the anatomical changes, we observed increasing in the jasmonic acid and reduction of zeatin concentrations in the leaves. Conclusions: The alteration of phytohormone contents and the anatomical changes indicates that the feeding of T. limbata activates plant defenses, but it is not active toward the insects off. The insect nymphs live inside the leaf-roll galls until adults' phase, feeding on the guava leaves xylem and phloem. In commercial guava orchard, the control of T. limbata nymphs have been difficult. Thus, the understanding of the composition of this protective layer can help to find the most effective and efficient control solution for this pest.

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Tank mixture of pesticides and foliar fertilizers for Triozoida limbata control in guava trees (Psidium guajava L.)

Cited by 3 publications

References 16 publications

Electrostatic Spraying Effect on Spray Deposition and Powdery Mildew Control in Soybean

Electrostatic Spraying Effect on Spray Deposition and Powdery Mildew Control in Soybean

Enhanced solubility of foliar fertilizer via spray dryer: Process analysis and productivity optimization by response surface methodology

The Psyllids Triozoida Limbata Supplant the Defenses of Psidium Guajava Plants to Garentee Feeding and Protection

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