![]() rapa and the activity of metabolic enzymes of S. Systematic analysis was provided on the biomass of B. exigua and the biomass accumulation of its host plant Brassica rapa, and the influence of the N/P ratio in plant fertilizer on this interaction. The study explored the interaction between the damage of S. However, when defoliation intensity increased, the difference in CarE activity between fertilizer categories was little. ![]() Higher N proportion contributed to reduced carboxylesterase (CarE) activity at high intensity, short-term defoliation. Higher P likely enhanced acetylcholine esterase (AChE) activity at lower degrees of defoliation, but a higher N proportion resulted in higher AChE activity at higher degrees of defoliation. However, with increased herbivorous intensity, a higher proportion of P played a more important role in increasing the activities of CAT and SOD. High proportion of N also enhanced the activity of two antioxidant enzymes, catalase (CAT) and superoxide dismutase (SOD) in low density of beet armyworm. There was no significant difference in root biomass under most conditions. Fertilizer with a higher proportion of N appears to maintain stem biomass in defoliated seedlings similar to controls that are not exposed to herbivory. Compensatory growth of leaf biomass was detected under fertilizer with N: P = 3: 1. The results showed that fertilizer type can significantly influence interactions between caterpillars and its hosts. exigua enzyme activities in response to five fertilizer treatments with different N: P ratios of 1: 5, 1: 3, 1: 1, 3: 1 and 5: 1. exigua herbivory on host plant biomass and on S. In the present study, we explored effects of different intensities and durations of S. Spodoptera exigua is an important agricultural pest that has caused serious economic loss, especially in recent decades. Fertilizer with different ratios of nitrogen (N) to phosphorus (P) can influence crop plant performance and defense against herbivores.
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