| ecotoxicological hazards of herbicides on biological attributes of zygogramma bicolorata pallister (coleoptera: chrysomelidae). | ecotoxic effects of commonly used herbicides i.e. glyphosate, atrazine, metribuzin, alachlor and 2, 4-d were evaluated on the biological and demographic parameters of zygogramma bicolorata pallister on parthenium in laboratory. the herbicides used in the bioassay were within a minimum range of their recommended field dose. in direct toxicity experiment, 2,4-d and alachlor caused the highest mortality of 3rd instars and prolonged the development time. fecundity and eggs viability were also signif ... | 2016 | 27077536 |
| effects of thermal regimes, starvation and age on heat tolerance of the parthenium beetle zygogramma bicolorata (coleoptera: chrysomelidae) following dynamic and static protocols. | temperature and resource availability are key elements known to limit the occurrence and survival of arthropods in the wild. in the current era of climate change, critical thermal limits and the factors affecting these may be of particular importance. we therefore investigated the critical thermal maxima (ctmax) of adult zygogramma bicolorata beetles, a biological control agent for the invasive plant parthenium hysterophorus, in relation to thermal acclimation, hardening, age, and food availabil ... | 2017 | 28052099 |
| lethal and sublethal effects of insecticides on the biological attributes of zygogramma bicolorata pallister (coleoptera: chrysomelidae): a biocontrol agent of parthenium hysterophorus l. | acute toxicity and sublethal effects of six commonly used insecticides, i.e., malathion, carbaryl, imidacloprid, cypermethrin, dimethoate, and monocrotophos, were evaluated through biological and life table parameters of zygogramma bicolorata pallister in laboratory. concentration of these insecticides was within the minimum ranges of recommended field rate. among the insecticides tested for acute toxicity, monocrotophos and imidacloprid caused the highest mortality of third instars and prolonge ... | 2017 | 28144909 |
| evaluation of darwin's fecundity advantage hypothesis in parthenium beetle, zygogramma bicolorata. | in the parthenium beetle, zygogramma bicolorata pallister (coleoptera: chrysomelidae), variation in body size exists between and within the sexes. the females are larger than the males. darwin (1874) proposed the fecundity advantage hypothesis, i.e. large sized female produce more progeny, with subsequent studies supporting as well as refuting the hypothesis. thus, in order to evaluate whether this hypothesis stands in z. bicolorata we performed experiments to investigate the role of body size i ... | 2013 | 24006336 |
| seasonal variation in the effectiveness of the leaf-feeding beetle zygogramma bicolorata (coleoptera: chrysomelidae) and stem-galling moth epiblema strenuana (lepidoptera: tortricidae) as biocontrol agents on the weed parthenium hysterophorus (asteraceae). | variation in the effectiveness of biocontrol agents on the weed parthenium hysterophorus l. was evaluated at two properties (mount panorama and plain creek) in queensland, australia for four years (1996-2000) using a pesticide exclusion experiment. at mount panorama, higher levels of defoliation by the leaf-feeding beetle zygogramma bicolorata pallister and galling by the moth epiblema strenuana walker in 1996-97 coincided with an above average summer rainfall, but in the following three years w ... | 2003 | 14641978 |
| effectiveness of introduced biocontrol insects on the weed parthenium hysterophorus (asteraceae) in australia. | six species of insects and a rust fungus have been successfully established for biocontrol of the weed parthenium hysterophorus l. in queensland, australia. effectiveness of biocontrol insects was evaluated at two properties in queensland during 1996-97 based on an exclusion experiment using insecticides. parthenium-infested plots with and without biocontrol insects were sampled at monthly intervals and the impact of biocontrol insects on parthenium at individual plant and whole population level ... | 2001 | 11415470 |