Effects of climate variability on insect pests of cabbage: adapting alternative planting dates and cropping pattern as control measures

Tanyi, Clovis B.; Ngosong, Christopher; Ntonifor, Nelson N.

doi:10.1186/s40538-018-0140-1

Cited by 14 publications

(8 citation statements)

References 36 publications

(44 reference statements)

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“…Similarly, in 2020 wet season, the mean maximum and minimum temperatures of Boro experimental site (2013) who reported that cabbage insect pests are affected either positively or negatively with variations in seasons due to variations in rain precipitations and temperatures.In addition, P. xylostella larvae were significantly higher at Boro experimental site relative to Tengeru experimental site and varied significantly from season to season. These results agree withPatra et al (2013) andTanyi et al (2018) who reported that, the incidence and infestations of P. xylostella on cabbage crops vary from region to region. The rainfall precipitations and temperatures of Boro experimental site might have contributed the higher abundances of P.xylostella larvae compared with Tengeru study site whereas the abundance was low.…”

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confidence: 93%

“…The rainfall precipitations and temperatures of Boro experimental site might have contributed the higher abundances of P.xylostella larvae compared with Tengeru study site whereas the abundance was low. The results concur withTanyi et al (2018) andPatra et al (2013) who reported that, population building up of P. xylostella is favoured by warm conditions and rain precipitations of the region and the season. Moreover,Ayalew (2006) reported that rain precipitations and temperatures ranging from 25 to 33 °C have significant influences on the population of P. xylostella.…”

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confidence: 92%

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Evaluation of selected botanicals as insecticides against cabbage insect pests in Tanzania

Mpumi¹

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Synthetic pesticides are frequently and unwisely used to control cabbage insect pests by smallholder farmers despite the environmental pollution and insect pests’ resistance development. This work assessed the insecticidal efficacy of botanicals from Tephrosia vogelii, Croton dichogamus and Syzygium aromaticum against cabbage insect pests in Northern Tanzania. Firstly, larvicidal action of extracts against Crocidolomia binotalis and Plutella xylostella larvae was assessed in the laboratory. Secondly, insecticidal and synergistic actions of aqueous extracts against cabbage insect pests were assessed in field experiment. Lastly, chemical compounds in S. aromaticum and in C. dichogamus were determined. The larvicidal activities of extracts were assessed for mortality of ten larvae into 9 cm Petri-dishes for 24 hours of exposure. Chlorpyrifos and acetone were used as a positive and negative control, respectively. The insecticidal efficacy of 10%, 5% and 1% w/v of T. vogelii, C. dichogamus and S. aromaticum aqueous extracts and their mixture (2.5% and 5%) was assessed against cabbage insect pests in the field. Chlorpyrifos was used as a positive control, and water and water plus soap were used as negative controls. The GC-MS was used for compounds identification in C. dichogamus and in S. aromaticum. Results from the study revealed that S. aromaticum extract (16, 24 and 32 mg/mL), T. vogelii (24 and 32 mg/mL) and C. dichogamus (32 mg/mL) gave 100 ± 0.0% mortality of C. binotalis larvae after 24 hours of exposure. Moreover, S. aromaticum extract (8, 16, 24 and 32 mg/mL), T. vogelii (16, 24 and 32 mg/mL) and C. dichogamus (32 mg/mL) gave 100 ± 0.0% mortality of P. xylostella larvae after 24 hours of exposure. The aqueous extracts from those plants significantly (P ≤ 0.05) lowered the population of cabbage insect pests compared with negative controls. The 5% of aqueous extract from mixed plants possessed significantly (P ≤ 0.01) lower population of cabbage insect pests in both wet seasons compared with other concentrations. Then, it was followed by 10% of S. aromaticum, C. dichogamus and T. vogelii aqueous extracts and 1% and 5% of aqueous extracts of S. aromaticum, C. dichogamus and T. vogelii and 2.5% of aqueous extracts from the mixed plants significantly lowered the population of insect pests compared with negative controls in both seasons. The compounds identified in S. aromaticum, at higher percent were Eugenol (52.66%); Eugenol acetate (20.46%) and β-caryophyllene (7.52%). Moreover, the compounds identified in C. dichogamus at higher percent were 4,6-Bis (4-chloro-3-(trifluoromethyl) phenoxy)-2-pyrimidinol (25.08%); Cholestan-6-en-3-ol (18.63%) and 1-Heptadecene (7.34%). These compounds could be responsible for larvicidal and insecticidal activities against cabbage ii insect pests. Therefore, these plants can be recommended to be used by smallholder farmers for cabbage insect pest control at higher concentrations and development of insecticides.

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confidence: 93%

supporting

confidence: 92%

Evaluation of selected botanicals as insecticides against cabbage insect pests in Tanzania

Mpumi¹

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“…Multiplication of pests preferred the hot climatic condition (off-season) but in cold condition (Nov-Feb) very few insects infest the cabbage 26 . According to Tanyi 27 late plantation of cabbage (April) reduce the pest population of cabbage looper larvae, webworm larvae and P. xylostella when compared to normal and early plantings. This method is considered a feasible, cost-effective pest management strategy that can be implemented by the farmers.…”

Section: Current Biological Control Of Crucifer Pestsmentioning

confidence: 99%

Current biological approaches for management of crucifer pests

Mayanglambam

Singh

Rajashekar

2021

Sci Rep

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Cabbage is considered as one of the most commonly found vegetables and it has been cultivated in large areas throughout the year. As it is mostly grown in large areas, higher rate of pest infestation likely to occur, which hinder its total production and consumption. However, continuous use of synthetic pesticides in agricultural pest management often leads to various negative impacts such as development of resistance by the pest, adverse effect on non-target organisms and hazardous effect on environment. These drawbacks led to an alternative approaches for control of crucifer pests that are cost effective, biodegradable, low toxic effect on non-target organisms and eco-friendly. This review brings together all the information of different biological practices for management of crucifer pests and list of botanical insecticides and entomopathogenic organisms that are being reported. This will help in establishing the knowledge of limited studies on pest management using different biological control methods to more challenging research and conveys the importance of pest management system for taking research forward.

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“…The interaction of planting dates and Piper emulsion or intercropping treatments can be effectively used to control cabbage pests (diamondback moth, Plutella xylostella and cabbage webworm, Hellula undalis and cabbage Looper, Trichoplusini) to improve yields, with the late planting date as viable alternative farm-level adaptation to climate variability. These represent costeffective and environmentally friendly pest management strategies that can be adopted by farmers to control cabbage pests below the economic injury threshold and improve yield (Tanyi et al 2018). Similarly, insects employ pheromones and allelochemicals to perceive their surroundings, which is a crucial process.…”

Section: Integrated Pest Management (Ipm) and Recent Tools For Pest M...mentioning

confidence: 99%

Emerging Insect Pests of Vegetable Crops under Changing Climate Scenario

Divekar,

Halder,

Srivastava

et al. 2024

isvs

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Crop losses in vegetables vary greatly depending on plant variety, cropping season, geographical location, and pest damage potential. Vegetable crops are heavily impacted by insect pests and diseases due to their softness, fragility and short duration in comparison to other crops. An emerging insect pest is one that has been observed in a specific crop-infested area and has progressively increased in population over time. Emerging insect pests have the potential to cause economic harm. In other words, an emerging insect pest is a pest insect whose position has shifted from minor to major or secondary to primary pest. The number of existing minor pests is increasing, as is the arrival of new ones, such as mealybugs, fruit flies, stem borers, diamondback moths among phytophagous insects and red spider mites among acarine. Recent infestations, such as South American tomato pinworm and chili black flower thrips, have caused serious damage to tomato and chili harvests. This review envisages on the variables that contribute to the establishment of new invasive pests, the persistence of main pests, general pest management practices, and integrated pest management to achieve sustainable vegetable production.

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Effects of climate variability on insect pests of cabbage: adapting alternative planting dates and cropping pattern as control measures

Cited by 14 publications

References 36 publications

Evaluation of selected botanicals as insecticides against cabbage insect pests in Tanzania

Evaluation of selected botanicals as insecticides against cabbage insect pests in Tanzania

Current biological approaches for management of crucifer pests

Emerging Insect Pests of Vegetable Crops under Changing Climate Scenario

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