The maize stem borer Chilo partellus (swinhoe) is one of the most destructive pests of maize. This species is most important at altitudes below 1500 meters above sea level .It's magnitude of damage ranges from 26.7 to 80.4. In young plants the shoot can be killed, causing a "dead heart". In older plants the upper part of the stem usually dies as a result of the boring of the caterpillars. Several contact and systematic insecticides are being used for its managemen. Therefore, it necessitated evaluating the relative persistence of insecticides and neem based formulations commonly used against this borer pest for devising its economically effective management programme.
Abstract-Zinc (Zn) deficiency is the most widespread micronutrient disorder in rice (Oryza sativa) The objective of this paper was to examine alternative evaluation methods and to identify the most informative traits that would provide realistic information for rice breeders and to map quantitative trait loci (QTLs) associated with tolerance The most severe symptom in the field was high plant mortality. Zinc interfered with translocation of iron from roots to above ground parts of Glycine max. (L.) Merrill var. Hawkeye. During periods in which zinc impeded iron translocation, it also suppressed the production of reductant by roots. Addition of iron, as a ferric metal chelate (iron ethylenediaminedihydroxyphenylacetic acid), to the growth medium overcame the interference of zinc. In the root epidermis, potassium ferricyanide formed a precipitate (Prussian blue) with ferrous iron derived from the previously supplied iron ethylenediaminedihydroxyphenylacetic acid. The reduction of ferric iron was suppressed by zinc. In a field experiment on silt loam calcareous soil, the direct and residual effect of zinc and zinc amended organic manures were studied on rice (Oryza sativa L.) followed by barley (Hordeum vulgare L.) and rice respectively. Visual Zn deficiency symptoms were observed on rice in on zinc plots. Application of zinc significantly increased the crop yield. The magnitude of yield response was intensified where zinc was applied in conjunction with organic manures. The highest Zn uptake in these three crops was recorded at 5 kg Zn amended with 10t compost /ha.
An experiment was laid out with 12 treatments including control to find out the persistence of toxicity of insecticides in dust and wettable formulations at their recommended concentrations during winter season on mustard crop. The residual effectiveness was worked out in the laboratory by observing mortality on the treated apical growth parts of mustard plant of each treatment after 24 hrs, 5 and 10 days of insecticidal applications and in the field by taking observations on aphid population. Both under field and laboratory conditions, fenitrothion 0.1% spray and phenthoate 2% dust proved most effective. Carbaryl 0.1% spray proved ineffective. After 10 days of treatment all insecticides of dust and wettable formulations last their toxicity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.