Showing 4 results for Cucumber
Safarali Mahdian, Seyed Yahya Kazemi, Behnam Amiri,
Volume 1, Issue 1 (3-2012)
Abstract
Vegetables are attacked by different pests and diseases during their growth. Some fruits such as cucumber have sprayed regularly against diseases like Pseudoperonosporacubensisspecially in humid areas, and after a short time the cucumber are picked up and the amount of pesticide residue are measured and comparing with Maximum Residue Level (MRL). In this research the amount of Mancozeb fungicide has quantified in cucumber samples in Sari district. So in this order 26 samples of cucumber are collected and were carried to the laboratory. Samples of fruits are weighted and washed by using of n- hexan in Suksoleh device. After concentrating the obtained solution put in spectrophotometer set for measuring the optical density with 280 nanometer wave lengths and the amount of uv absorbance of samples and standard solutions were checked. The obtained numbers was changed into all right amount of mancozeb by using Excel software and Cx= α. Cs / β. Vx equation. Results showed that the amount of remained mancozeb fungicide was less than maximum residue limit in 77 percent of samples and more than maximum residue limit in 23 percent of samples in these periods. Also it defined among the samples which have had residue higher than standard limit, just 2 samples have been increased more than 1 milligram per kilogram.
Mehdi Sadravi, Marzie Tavakoli,
Volume 3, Issue 2 (9-2014)
Abstract
Downy mildew, caused by Pseudoperonospora cubensis, is the most important disease of cucumber production in humid areas and greenhouses in Iran. The yield loss of cucumber due to downy mildew may reach to 100%. Because the chemical control is the main method of disease control, especially in susceptible cultivars, establishing a forecasting program which is based on estimation of pathogen population, recording the temperature and relative humidity of field and greenhouse, can reduce the risk of disease epidemic. So by proper application of a protective or systemic fungicide can reduce the disease incidence, production costs and the most important, the amount of fungicide residue.
Shalaleh Moslehi, Negin Eskandarzadeh, Nahid Vaez,
Volume 10, Issue 1 (2-2021)
Abstract
Moslehi SH, Eskandarzadeh N, Vaez N (2021) Inhibitory effects of aquatic extracts of
Datura stramonium,
D. metel and
Hyoscyamus niger on
Meloidogyne javanica. Plant Pathology Science 10(1):27-41. Doi: 10.2982/PPS.10.1.27.
Introduction: Root-knot nematodes are one of the most important groups of plant parasitic nematodes in terms of economic damage to agricultural products. Biological control is one of the most environmentally friendly methods for management of nematodes. Material and Methods: The effects of aqueous extracts of jimsonweed (Datura stramonium), metel (Datura metel) and henbane (Hyoscyamus niger) was evaluated against Meloidogyne javanica on cucumber, under greenhouse condition, in this study. Cucumber plants were inoculated with suspension of eggs and second stage juveniles of nematode. After a week, 1.66% concentration of each plant extract were irrigated in the pots. Plants were harvested after 45 days and some plant growth parameters and nematode reproductive parameters were recorded. Results: The extract of any of the plants did not affect the number of knots on the roots and per gram of the roots. However, number of egg- masses per root and gram of root, treatments including nematodes and extracts had fewer masses compared to treatments without plant extracts. Final population and reproductive factor had also lower values in treatments with plant extract compared to treatments without it. In addition, the plant extracts had no negative effect on the growth factors of the cucumber in the greenhouse. Conclusion: The extracts of Datura stramonium, Datura metel and Hyoscyamus niger reduced the reproduction of nematodes respectively, therefore they can be considered as potential agents in biological control of root-knot nematodes.
Parastoo Pouraziz, Dr. Davoud Koolivand,
Volume 13, Issue 1 (2-2024)
Abstract
Pouraziz, P., & Koolivand, D. (2024). The application of biopolymers in the management of plants viral diseases. Plant Pathology Science, 13(1),125-134.
Polymers with natural origin are known as biopolymers. Due to their biocompatibility and biodegradable properties, biopolymers have a wide range of applications in various fields such as agriculture, medicine, and industry. Biopolymers limit the activities of plant pathogens by increasing the immune system of plants by influencing resistance genes and also activating resistance mechanisms. Therefore, the use of these substances to combat plant pathogens has found a wide application in agriculture. The use of biopolymers to deal with plant pathogens such as fungi and bacteria is a suitable solution to reduce their damage. Also, treatment of the virus-infected plant with biopolymers reduces the symptoms and damage of the disease. The molecular antiviral mechanisms of some biopolymers such as chitosan, chitin, oligochitosan, β-glucans, lentine, alginate, hydrogel and their compounds in the management of plants viral diseases are described in this article.
