Effect of host plant on gypsy moth diet and biological efficacy of Btk preparations

Abstract

The effect of two host plants, Turkey oak (Quercus cerris L) and black poplar (Populus nigra L) on gypsy moth (Lymantria dispar L) development was researched. The effect of host plant was determined based on the parameters which characterize the diet, growth and efficacy of conversion of ingested food of the third instar caterpillars. Along with the effect on development, the effect of host plant on the efficacy of biological preparation based on the bacterium Bacillus thuringiensis var. kurstaki in gypsy moth caterpillar suppression was also researched. The differences in parameters characterizing the diet, growth, and efficacy of ingested food between experimental groups of caterpillars grown on poplar and Turkey oak leaves are explained by the differences in the chemical composition of the leaves of these tree species. The efficacy of Btk preparation is conditioned by the mechanism and content of different groups of defense substances in the leaves of the applied tree species

Efficacy of the Horse Chestnut, Aesculus hippocastanum Seeds Extract on some Biological Activities of Culex pipiens and the Detection of its Phytochemical Constituents

“…Saponins are reported as extremely poisonous compounds that cause hemolysis of blood (Kar, 2007). They are Plant secondary metabolites that are known to be effective repellents for a number of harmful insects (Milanovic, 2006;Erturk et al, 2006 andShields et al, 2006) which is in line with our results. Pelah et al (2002) studied the larvicidal activity of commercial bark saponin extract from Quillaja saponaria on 3rd-4th instar larvae of Aedes aegypti and Culex pipiens.…”

Antifeeding activity of several plant extracts against Lymantria dispar L. (Lepidoptera: Lymantriidae) larvae

“…According to Shields et al (2006), L. dispar best develops on species belonging to the genus Quercus (Janković, 1958), especially Q. robur, Q. cerris (Milanović, 2006) and/or Q. rubra. Previous research by Gvozdenac et al (2010Gvozdenac et al ( , 2011 has also indicated that L. dispar larvae feed most intensively on Q. robur as their primary host, which was confirmed in this work.…”

“…For L. dispar, repellent activity is especially common by plants with high alkaloid contents (Dosktotch, 1980). In recent years, antifeeding effects of various plant extracts have been studied by several authors (Zabel et al, 2002;Milanović, 2006;Kostić, 2008;Gvozdenac et al, 2010Gvozdenac et al, , 2011Pavela, 2010). According to Simmonds (2000), more than 6,250 plants have been tested for different insecticidal activities since 1985, while Parkash and Rao (1997) confirmed that about 870 herbal products with insecticidal or repellent antifeeding effect were used in agriculture.…”

“…Also, due to increased environmental demands, the promotion of pest control agents of botanical origin (plant-based insecticides) is gaining in importance regarding the control of L. dispar in organic and sustainable agriculture. Plant secondary metabolites (terpenoids, alkaloids, saponins, polyphenols and phenolic glycosides) and their derivatives are known to be effective repellents for a number of harmful insects (Milanović, 2006;Erturk et al, 2006;Shields et al, 2006). For L. dispar, repellent activity is especially common by plants with high alkaloid contents (Dosktotch, 1980).…”

The outbreaks of the gypsy moth in the forests of National Park Đerdap in the period from 1996 to 2014

“…The abundance, i.e. the population level of the gypsy moth is conditioned by the characteristics of the species, physiological conditions of some instars, as well as by the biotic and abiotic factors, such as weather conditions, type and quality of host plants, pathogens, natural enemies (Milanović et al, 2006;Tabaković-Tošić, 2011, 2012Tabaković-Tošić et al, 2013).…”