Toxicity Aqueous Extract of Castor Bean (Ricinus communis) to Maconellicoccus hirsutus (Green) (Hemiptera: Pseudococcidae)

Holtz, Anderson Mathias; Carvalho, José Romário de; Gomes, Mylena da Silva; Neto, Vergilio Borghi; Piffer, Ana Beatriz Mamedes; Aguiar, Ronilda Lana

doi:10.9734/jeai/2019/v38i130291

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Averages followed by the same letter, uppercase on the line and lowercase on the column, do not differ by the F and Scott-Knott test, respectively, at the level of 5% probability The higher percentages of mortality were observed in the form of indirect application could be attributed to the fact that the cocoa leaf discs were completely immersed in the solutions, which could act on individuals in different ways, either by ingestion (through the digestive system, before penetration into plant tissue) or by contact, crossing the integument and through the airways, which would facilitate the intoxication process, since M. hirsutus has a thin layer of powdery secretion around its body that protects it in the case of spraying [2,16]. However, some authors argue that the action by contact is faster than the mode of action by ingestion.…”

Section: Resultsmentioning

confidence: 99%

Toxicity of Jatropha and Neem Oil Combination on Pink Hibiscus Mealybug

Holtz

Piffer

Holtz

et al. 2021

JEAI

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Maconellicoccus hirsutus (pink hibiscus mealybug) is a polyphagous pest species reported in about 350 species of host plants worldwide. The chemical control method is still the most used for the control of agricultural pests. In view of this, we aim to evaluate the potential of the concentration of oils extracted from the species Azadirachta indica (Neem) and Jatropha curcas (Jatropha) on M. hirsutus, aiming at a management alternative for the pest. The experiments were carried out in air-conditioned chambers at a temperature of 25 ± 1ºC, relative humidity of 70 ± 10% and a photophase of 12h. The concentration 3% (v v-1) (defined in preliminary dilution tests) was used in the tests, with 11 interaction ratios between the oils. Mortality was assessed daily up to 72 hours after spraying. The application was carried out in two ways: indirect - on the food and walking surface; and direct - about insects. The indirect application caused higher levels of mortality in relation to the direct application. However, there was no significant difference between the concentrations for the indirect application. In the form of direct application, the combination of 60:40% neem oil and jatropha oil was the treatment that provided the highest mortality of the M. hirsutus (86.21%). The combinations between neem and jatropha oils demonstrated the potential to control M. hirsutus in both routes of application, being an alternative for the management of this pest.

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Section: Resultsmentioning

confidence: 99%

Toxicity of Jatropha and Neem Oil Combination on Pink Hibiscus Mealybug

Holtz

Piffer

Holtz

et al. 2021

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“…new resistant populations, cause mortality of natural enemies present in the environment, the intoxication of the surrounding fauna, and pollution of water bodies [9] . As an alternative to synthetic chemical control, research related to the use of extracts and substances obtained from plants has demonstrated satisfactory effectiveness in pest control [10,9,11] . Among the plants with acaricidal effects, peppers, belonging to the Solanaceae family, have a variety of alkaloid compounds and saturated or unsaturated fatty acids.…”

Section: Introductionmentioning

confidence: 99%

Aqueous extract of chili pepper in the management of the pink hibiscus mealybug (Hemiptera: Pseudococcidae)

Marchiori¹,

Holtz²,

Piffer³

et al. 2023

J. Entomol. Zool. Stud.

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Maconellicoccus hirsutus (Hemiptera: Pseudococcidae) is a polyphagous pest, attacks several crops of economic importance, including cocoa and coffee. Due to its rapid dissemination, studies are needed to develop management programs to combat this pest, as few studies seek the effectiveness of alternative products such as plant extracts, which can be promising in its control. Therefore, this work aimed to evaluate the efficiency of the aqueous extract of the fruits of chili pepper Capsicum frutescens (Solanaceae) in the management of the pink hibiscus mealybug. The tests were carried out in acclimatized chambers regulated at a temperature of 25 ± 1 ºC, relative humidity of 70 ± 10%, and a 12hour photophase. The treatments consisted of five extract concentrations: 0.0, 2.5, 5.0, 7.5, and 10% (weight/volume). Coffee leaves were submerged in the aqueous solution of pepper extract and mounted in Petri dishes with agar solution to transfer the mealybugs. Each treatment consisted of 10 repetitions with 10 young mealybugs each. The experiment was evaluated 24, 48, and 72 h after the procedure. Data were submitted for analysis of variance and regression test (p≤0.05). Lethal concentration (LC50) was estimated using Probit analysis. The mortality of mealybugs increased with the increase in extract concentrations, with mortalities greater than 70% from the lowest concentration. The data fit the Probit model, with χ² of 1.0478 (p > 0.05) and a curve slope of 1.7799. The LC50 was estimated at 0.96%. Thus, the aqueous extract of Capsicum frutescens fruits is promising for the management of M. hirsutus.

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