Natural Pest Control Methods for Green Bean Crops

Jim Crocker
14th June, 2024

Natural Pest Control Methods for Green Bean Crops

Green Bean (Phaseolus vulgaris)

Photo adapted from: M. Socorro González Elizondo / CC BY SA (Source)

Key Findings

  • The study in Egypt tested biological control agents and conventional pesticides on green bean pests
  • Predatory species Chrysoperla carnea and Phytoseiulus persimilis effectively reduced whitefly and spider mite populations
  • The fungus Metarhizium anisopliae also significantly controlled spider mite populations, offering an alternative to chemical pesticides
Green beans, Phaseolus vulgaris L., are a staple in many diets worldwide, valued for their edible seeds and pods. However, they are highly susceptible to pest infestations, particularly by insects and mites, which can significantly reduce yield and quality. A recent study conducted by Al-Azhar University[1] aimed to evaluate the efficacy of various biological control agents and conventional pesticides against major pests such as the whitefly, Bemisia tabaci, and the two-spotted spider mite, Tetranychus urticae, in green bean crops in Egypt. The study investigated the effectiveness of the predatory species Chrysoperla carnea (Stephens) and Phytoseiulus persimilis Athias-Henriot, as well as the entomopathogenic fungus (EPF) Metarhizium anisopliae. Additionally, two conventional pesticides, Mospilan and Vertimec, were included in the evaluation. The experiments were conducted at two locations, Giza and El-Menoufia Governorates, to ensure the results' robustness across different environmental conditions. The two-spotted spider mite, Tetranychus urticae, is a particularly challenging pest due to its ability to develop resistance to many pesticides[2]. This resistance complicates pest management and necessitates the exploration of alternative control methods. The study by Al-Azhar University builds on previous research that highlighted the potential of Metarhizium anisopliae as an effective alternative to conventional acaricides[3]. In the Al-Azhar University study, green bean plants were monitored for pest infestation levels before and after treatment applications. The treatments included the predatory species, the fungus, and the conventional pesticides. The efficacy of each treatment was assessed based on the reduction in pest population density and the overall health and yield of the green bean plants. The results indicated that both Chrysoperla carnea and Phytoseiulus persimilis were effective in reducing the populations of Bemisia tabaci and Tetranychus urticae, respectively. These predatory species offer a biological control method that can reduce reliance on chemical pesticides, which is crucial given the high resistance levels observed in Tetranychus urticae populations to many traditional pesticides[2]. Moreover, the entomopathogenic fungus Metarhizium anisopliae demonstrated significant efficacy in controlling Tetranychus urticae populations. This finding aligns with previous studies that showed the potential of Metarhizium anisopliae as an alternative to chemical acaricides[3]. The fungus works by infecting and killing the mites, thereby reducing their population and the damage they cause to the plants. The conventional pesticides, Mospilan and Vertimec, also showed effectiveness in controlling the pest populations. However, given the increasing resistance of pests like Tetranychus urticae to many pesticides[2], the study underscores the importance of integrating biological control agents into pest management strategies. By doing so, it is possible to reduce the selection pressure for resistance development and maintain the efficacy of chemical pesticides. In summary, the study conducted by Al-Azhar University provides valuable insights into the effectiveness of various pest control methods for green bean cultivation. The use of predatory species and entomopathogenic fungi offers promising alternatives to conventional pesticides, which is particularly important in the context of increasing pesticide resistance. This integrated approach to pest management can help ensure sustainable and effective control of pests in green bean crops, ultimately leading to better yield and quality.

AgriculturePlant ScienceMycology

References

Main Study

1) Using predatory species and entomopathogenic fungi as alternatives to chemical pesticides in green bean field

Published 13th June, 2024

https://doi.org/10.1186/s41938-024-00799-z

Related Studies

2) Status of pesticide resistance and associated mutations in the two-spotted spider mite, Tetranychus urticae, in China.

https://doi.org/10.1016/j.pestbp.2018.07.008

3) Efficacy of Metarhizium anisopliae in controlling the two-spotted spider mite Tetranychus urticae on common bean in screenhouse and field experiments.

https://doi.org/10.1111/1744-7917.12111


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