جستجوی مقالات مرتبط با کلیدواژه « قارچ خوراکی » در نشریات گروه « گیاهپزشکی »

In this study, the predatory mite Blattisocius mali was evaluated as a candidate predator for the biological control of fungus gnat, Lycoriella auripila in mushroom cultivation salons and greenhouses and its biological characteristics and population parameters were investigated under laboratory conditions at 25 °C, 70±5 % relative humidity and 16:8 h (L:D) photoperiod. The mean of the total pre-adult period in this experiment was 4.45 days and the lifespan of male and female adults was 18.45 and 20.46 days, respectively. The mean of the oviposition days was 13.88 days and the fecundity was 90.96 (eggs/female). Also, the predatory mite, B. mali feeding on the eggs of the L. auripila had a significant intrinsic rate of population increase (r) equal to 0.386 day-1 and its population increased about 44.551 times every 9.882 days. The results of this study showed the B. mali is a potential predator that can grow and reproduce and complete its life cycle fed on the eggs of L. auripila, successfully. Therefore, this predator can act as a suitable and safe biological control agent to reduce the fungus gnat population and be considered as a biological control agent in the integrated control of this pest.

The edible mushroom mosquito Lycoriella auripila (Dip.: Sciaridae) causes quantitative and qualitative reductions in crop yield worldwide, that is, Iran. The present study was conducted to estimate the efficacy of the entomopathogenic nematode Steinernema feltiae and the bacterium Bacillus thuringiensis, separately and simultaneously, in controlling this mushroom mosquito. In the laboratory study, the efficacies of different concentrations of S. feltiae (Sf), B. thuringiensis subsp. israelensis (Bti) and Dichlorvos pesticide were investigated. Then, nine treatments, including the interaction between Sf and Bti, were performed in addition to the laboratory treatments in the field test. The mushroom production yields in the control and treatment groups were compared. Statistical analysis of data was done based on the number of whole insects caught in sticky yellow card traps and larvae attracted to potato slices. In the conducted tests, the reductions in the insect population in the treatments compared with the control were calculated. The laboratory experiments showed positive effects of all treatments on pest control. The concentrations of 1×106 IJ/m2 Sf and 2/1000 Bti had the highest mortality rate of pest larvae with 81.6 and 77.4% mean mortality, respectively. Nematode Sf at this concentratration acted better than Dichlorvos for the control of this pest. In the field measurements, the highest population decreases were recorded in Bti with 75.7% control efficacy based on yellow sticky cards and in treatments of Dichlorvos and half-dose of two-biocontrol agent based on potato slices data with 75.3 and 74.8%, respectively. No significant difference was observed between Dichlorvos and Sf treatment for the control of this pest based on yellow sticky card data in field study. The obtained results recommend using these two biological control agents to control the L. auripila mosquito in edible mushroom cultivation halls.

Today mushroom cultivation has become one of the money making sources in industry and trade all around the world. Due to its production system, this rich nutritional product is under the attack of several pest agents. In this study, the arthropods existing in mushroom cultivation systems was collected through two production stages, spawning and casing from six production units in Zarandieh county, Marakazi province. Samples were separated by Berlese funnel and retained in Ethanol 70%; then identified by certified resources. The abundance of each species was caulcuated and the mean density of different species were compared statistically. In total, 1814 samples belonging to different orders of Insecta and Acari were collected. 790 samples were collected through spawning and 1024 samples through casing. Collected arthropods belonging to 15 species under 14 genera and 11 families. Tyrophagus putrescentiae was the most abundant species (18.91 ± 2.06%) with significant difference. Megaselia halterata (14.39± 1.88 %) and Lycoriella auripila (11.87 ± 0.47) were the most abundant species, subsequently. Among the collected species, two predators, Atheta coriaria and M. galber were identified. Most of the collected species were saprophagous and infected compost would be a possible way to introduce them into the mushroom cultivation systems. Samples like M. halterata, Megaselia scalaris, L. auripila, Colbodia fuscipes and T. putrescentiae were mycophagous and could make direct damage to mushroom product. Compost sterilizing would be an effective way to eliminate pest arthropods in mushroom cultivation systems.

Due to the importance of white button mushroom as a source of food and protein, the identification and control of its diseases are taken into consideration in the world. In Ardabil province, there are several mushroom production units. In this research, infected samples were collected from Ardabil, Namin, Sarein, Meshginshahr and Pars-Abad mushroom farms. After isolation and purification of fungicolous fungi from infected mushrooms and casing soil, macroscopic and microscopic features including colony characteristics on MEA/PDA and conidium/conidiophore size and shape were used for tentative-identification of isolates using valid keys. The results were confirmed by sequencing of ITS-rDNA region. In this study, among 72 fungal isolates, Lecanicillium fungicola, causal agent of dry buble, Trichoderma harizianum and T. virense causal agents of green mold, Mycogone perniciosa causal agent of wet bubble, and Cladobotrium mycophilum causal agent of cobweb were identified with 49, 18, 14, 14 and 5% frequency, respectively. This is the first study on mycopathogens of button mushroom in Ardabil province. The results may help to prevent and control the mycopathogenic fungi in button mushroom production units after additional research.

As the mushroom dipterans flies are permanent pests of mushroom farms, the growers frequently use the chemical pesticides. Since the mushroom growers and the consumers are always at the risk of chemical pesticides contamination, introducing non-chemical and biological methods is therefore necessary. This research was conducted with two experiments in the mushroom farm conditions. In the first experiment, a commercial formulation (Bioflash®) based on Bacillus thuringiensis subsp. israelensis was tested along with a number of common insecticides on composts. First experiment was carried out in a completely randomized design with seven treatments including Dimilin® 0.75 & 1 g/l, Bioflash® 1 & 2 ml/l, Tracer® 0.3 & 0.6 g/l and the control (the usual method of controlling flies with oreganophosphate insecticides) each with 10 replications. Based on the results of the first assay, an experiment was conducted in the mushroom farm conditions in three stages including Bioflash® incorporated into compost simultaneously with spawn inoculation, Bioflash® spray in precasing and Bioflash® drench into casing in comparison with the control. The results of the first experiment showed that all test insecticides were effective in decreasing the pest population, so that the average efficiencies of Dimilin® (1g/l), Tracer® (0.6 g/l) and Bioflash (2 ml/l) on 15 days after treatment were 67.9%, 74.2% and 79.9%, respectively with no significant difference among them. Farm experiment results showed that the application of Bioflash® drench into casing at six days after casing had the highest efficiency with 79.3% reduction in the population.

One of the most common pathogenic diseases of the button mushroom in Iran is wet bubble (Mycogone perniciosa). In this study, in order to develop a biological control system and production of healthy crop, the antifungal effect of aromatic medicinal plants were assayed as a safe replacement for chemical fungicides. M. perniciosa was isolated from infected A. bisporus cv. Sylvan 737. In order to evaluate the biocontrol possibility, the effect of six medicinal plant essential oils including garlic, horsemint, oregano, lavender, kotschyam thyme and eucalyptus were tested against M. perniciosa and evaluated their effects on button mushroom mycelium at 100, 500, 1000, 1500 and 2000 µl l-1 in vitro. Based on the results, kotschyam thyme and oregano were more toxic and minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) for M. perniciosa were 300 and 500 µl l-1, respectively. Interestingly, among the investigated essential oils, garlic oil showed a fungicidal effect on M. perniciosa at a lower concentration (MFC=1000 µl l-1) than button mushroom (MFC=1400 µl l-1). In general, garlic and lavender essential oils were found as the most effective and weakest oils against M. perniciosa, respectively. GC-MS analysis demonstrated that Trisulfide, di-2-propenyl, Piperitenone oxide,Thymol,1,8-Cineole, Thymol and Spathulenol were the main components of the above essential oils, respectively. It seems that garlic oil can be considered as a good alternative in biological control of wet bubble diseaseaccording to this research and considering consumerist tastes after additional researches.

In recent years brown blotch of cultivated mushroom (Agaricus bisporus) has been observed as a prevalent disease in Iran. The disease symptoms of the cultivated agaric include brown blotch, brown pit spots, rotting, weeping and drippy gill. Pseudomonas tolaasii has been cited as the causal agent of bacterial blotch, but much controversy exists regarding the involvement of this bacterium alone or blotch may be caused by more than one organism. In 2011, the diseased samples of mushroom were collected from Khorasan Razavi, Alborz, Tehran, Semnan, Ghazvin and Golestan provinces. Strains which were pathogenic on the cap of mushroom (pileus) were selected for further analysis. Biochemical, physiological and nutritional tests together with amplification of 1Kb region of 16S rDNA using Ps forward and reverse primers showed that all strains belong to Pseudomonas tolaasii. The isolated strains displayed different degrees of pathogenicity on mushroom. The presence of different virulence factors were evaluated among the strains. The results indicated that those strains which showed enhanced pyoverdin production had higher pathogenicity on agaric caps. There was no correlation between the existence of other virulence factors such as biofilm formation, motility, or PQS production and pathogenicity. Our results indicated that in P. tolaasii similar to other Pseudomonads, PQS exists but the actual role of this signal is not so clear. PQS dependent quorum sensing in P. tolaasii could not affect pathogenicity of this bacterium, thus most of the virulence determinants in this bacterium should be PQS independent.