Bioloical Aspects and Life Table Parameters of the Cotton Leaf–worm, Spodoptera Littoralis (Boisd.), on Different Vegetable Host Plants.

Faraghaly, Doaa; El-Sharkawy, A; Abbas, Afaf; Abdel-Wahab, Horia A.; El-Mewafy, Hala

doi:10.21608/jppp.2015.53664

Cited by 1 publication

(2 citation statements)

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“…In addition, the data obtained in the current work suggest low fertility of eggs laid by S. littoralis larvae fed on melon plants. The fecundity and fertility of S. littoralis females may be influenced by the host plant; in fact, cucurbitaceans are preferred plants for S. littoralis feeding but negatively affect insect reproductive parameters [38,39]. Our results were consistent with previous studies on lepidopteran pests showing a reduction in the lifespan and reproductive potential of insects fed on EPF-colonized plants or their offspring [25,31,36].…”

Section: Discussionsupporting

confidence: 90%

“…Differences in the plant volatile profile and secretion of metabolites have been described after insect feeding and fungal infection, as has systemically-acquired resistance, herbivore-induced resistance and induced systemic resistance of plants, with the accumulation of jasmonate and salicylic acid and the activation of resistance genes [41,42]. These processes can be amplified when the host plant is a suboptimal food resource for the insect pest, as observed in our work, in which melon plants were clearly non-favorable for S. littoralis in terms of certain parameters of its life table, such as egg fertility [38,39]. In this context, Jaber and Vidal [25] suggested that the loss of volatiles or secretion of metabolites may be induced after mechanical damage to a plant (i.e., the collection of foliar discs).…”

Section: Discussionsupporting

confidence: 52%

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Delving into the Causes and Effects of Entomopathogenic Endophytic Metarhizium brunneum Foliar Application-Related Mortality in Spodoptera littoralis Larvae

Garrido‐Jurado

Montes-Moreno

Sanz-Barrionuevo

et al. 2020

Insects

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The aim of the current study was to delve into the causes of mortality of Spodoptera littoralis larvae feeding on Metarhizium-colonized plants in the absence of fungal outgrowth on the cadavers as previous studies reported and to elucidate the possible indirect effects of this fungus-colonized diet. The effect was evaluated in experiments conducted using leaf discs of colonized plants and in planta using fungus-colonized whole plants. The mortality rates of larvae fed on Metarhizium-colonized melon leaves were 45.0% and 87.5%, and the average survival times were 6.6 and 3.1 days in experiments performed with discs and in planta, respectively. Notably, these mortality levels were not associated with observed apoptosis mediated by caspases 1, 3-7 and 8; thus, further investigation into the possible immune system reaction of the insect after the ingestion of colonized plants is required. The leaf consumption of S. littoralis larvae fed on melon-colonized leaves was lower than that on control plants in the disc experiments but not in experiments conducted in planta. In this regard, in experiments performed in planta, plant damage increased larval mortality in both fungally challenged and control larvae. There was also a meaningful effect of exposure to Metarhizium-colonized melon leaf discs on S. littoralis fitness, with significant reductions in 39.0% and 22.0% in female fecundity and egg fertility, respectively, detected in females emerging from pupae developing from larvae surviving exposure to colonized plant discs; all larvae died in the in planta experiments. Hence, the present work presents new findings revealing the high potential of endophytic entomopathogenic fungi to improve the outcome of foliar applications against chewing insects in the short, mid- and long term, by the reduction of the reproductive potential of surviving adults and reveals new insights into the development of bioassays with whole plants for more detailed evaluation of the impact of these fungi as endophytes used for plant protection.

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