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Effect of simulated herbivory on bellyache bush (Jatropha gossypiifolia L.) growth and implications for biological control

Kumaran, Nagalingam, Lockett, Catherine, Dhileepan, Kunjithapatham
Weed biology and management 2018 v.18 no.4 pp. 151-159
Jatropha gossypiifolia, biological control, biological control agents, biomass, defoliation, flowers, herbivores, invasive species, leaves, mature plants, multivoltine habit, plant height, pods, seedlings, shoot tips, Queensland
Understanding the ability of invasive plants to compensate for herbivory damage is crucial for their management, but this has been poorly studied in weed biological control. Bellyache bush (Jatropha gossypiifolia L.) is an invasive weed and a target for biological control in Australia. To understand the response of bellyache bush to herbivory, we simulated herbivory damage, under field conditions, at a site in north Queensland. Two size classes, that is, seedlings and mature plants were subjected to either defoliation, shoot damage or a combination of both, and the damage was inflicted once, twice or thrice at 6–7 weeks interval. All herbivory types significantly reduced growth and biomass when herbivory was inflicted twice or thrice, whereas the single application had limited impact. Shoot damage alone and defoliation + shoot damage had a greater negative impact than defoliation treatment on plant height, basal stem diameter, the number of leaves, root length and the number of shoot tips produced while increasing the number of dead shoot tips. Defoliation alone and defoliation + shoot damage had a greater negative impact on the number of flowers and fruit pods produced than shoot damage. The greater negative effects noticed when herbivory was inflicted twice or thrice suggest that multivoltine biological control agents that can inflict shoot damage and defoliation should be sought for the biological control of bellyache bush.