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Showing 2 results for Al-Ayat
Adel A. Al-Ayat, Ayman A. M. Atta, Hassan A. Gad,
Volume 11, Issue 4 (1-2022)
Abstract
In this study, the effect of five host plants on the biology and food consumption of the fall armyworm Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) was evaluated in Egypt. Developmental periods and weight of different growth stages, percentages of pupation and adult emergence, survival, and nutritional indices were evaluated on maize, castor oil, clover, broad bean, and lettuce. The results showed that the developmental period of S. frugiperda was significantly longer on the broad bean. The pupation percentage of S. frugiperda was significantly affected by the host plant. In contrast, the adult emergence was not significantly different on host plants. Our result also showed maximum weights in food consumption, and frass occurred in the larvae fed on lettuce. While the lowest weights for consumption were observed in larvae on maize and broad bean resulting in minimum frass weights. The highest percentage of approximate digestibility (AD) of the larvae was on broad bean and clover, and the lowest AD was by larvae fed on maize. The highest percentages of conversion of ingested food (ECI) and conversion of digested food (ECD) were observed for larvae fed on maize leaves. The lowest values of ECI and ECD were observed on larvae fed on broad bean leaves. Based on the results, it seems that lettuce, castor, and maize were preferred for S. frugiperda.
Volume 27, Issue 2 (March 2025)
Abstract
The present study was conducted to evaluate the efficacy of entomopathogenic nematode, Steinernema carpocapsae Weiser and three entomopathogenic fungi (Metarhizium anisopliae (Metschn.) Sorokin, Trichoderma harzianum Rifai, and T. viride Pers.) against the second and fourth larval instars of Spodoptera frugiperda (J. E. Smith). The results showed that S. carpocapsae caused a pronounced mortality to second and fourth larval instars of S. frugiperda using a leaf dipping method at 4 days post inoculation (dpi) with LC50 values of 52.03 and 4.11 Infective Juveniles (IJs) mL-1, respectively. On the other hand, the three tested entomopathogenic fungi caused a strong toxicity on larval instars of S. frugiperda. The fungus, T. harzianum, displayed the highest insecticidal activity on the second larval instar (LC50= 1.1×107 spores mL-1) and M. anisopliae on the fourth larval instar (LC50= 1.5×107 spores mL-1) after 10 dpi. Our results showed that S. carpocapsae completely inhibited pupation and adult emergence from treated larvae at 250 IJs mL-1. The lethal effect of entomopathogenic nematode and fungi against S. frugiperda larval instars indicates that these biological control agents could be useful candidates in integrated pest management programs for this invasive insect.
