The effect of subclinical mastitis on the concentration of immunoglobulins A,G, and M,total antioxidant capacity,zinc, iron,total proteins,and calcium in she-camel blood in relation with pathogens present in the udder

Tropical Animal Health and Production - The present study aims to evaluate the amount of immunoglobulins A, G, and M in she-camel blood serum in relation with the presence of pathogens in the...     

Effect of field history on the cereal leafminer Syringopais temperatella Led. (Lepidoptera: Scythrididae) and its preference to different wheat and barley cultivars

Due to the importance of wheat and barley production in Jordan, prevention of the cereal leafminer, Syringopais temperatella Led. (Lepidoptera: Scythrididae) is of vital importance. The insect is a severe pest and plays an important role in limiting the production of these crops. The use of insecticides is neither economic nor sustainable, so that there is an urgent need to initiate a viable alternative to chemical control. Therefore, this study aimed at investigating the effect of crop rotation on S. temperatella and its preference to different wheat and barley cultivars. The field history experiment was conducted using five different crop rotations. For the preference experiments in the laboratory, two major experimental groups were conducted. The first was set up to measure the consumed leaf area and the second one to record the number of larval attaches. Each group consisted of four different subgroups; 6 wheat cultivars, 6 barley cultivars, two and one cultivar of each crop. The results indicated that the infestation percentage and number of larvae were significantly the lowest in the crop rotation, wheat/chickpea/wheat while the highest were recorded for barley/barley/barley. The preference results showed that wheat cultivar, Horani Nawawi is significantly the most preferred while Horani 27 is the least cultivar. In case of barley, Mutah was the most preferred cultivar and the least preference was recorded for Athroh. Also, wheat was significantly less preferred than barley. The wheat cultivars, Sham, Em-Qees and Acsad 65 had the highest number of attaches and Deer Alla the least. In contrast, the barley cultivar, Acsad 176 had the highest and Athroh and Rum 1 had the least attaches. Barley cultivars had higher attaches than wheat ones. There was a positive relation between the infestation percent and number of larvae, as well as the consumed area and number of attaches in all of the four subgroups. In conclusion, the crop rotation, wheat/chickpea/wheat should be followed and there is a preference variation among the tested wheat and barley cultivars.     

Equilibrium,kinetics and artificial intelligence characteristic analysis for Zn (II) ion adsorption on rice husks digested with nitric acid

Paddy and Water Environment - The use of low-cost adsorbents produced from rice husks that can selectively remove zinc (II) ion from wastewater effluent has been investigated. The disorder and...     

Impact of Different US Genotypes of <Emphasis Type="Italic">Phytophthora infestans</Emphasis> on Potato Seed Tuber Rot and Plant Emergence in a Range of Cultivars and Advanced Breeding Lines

Seed pieces of different potato cultivars and advanced breeding lines (ABLs) from north central US breeding programmes were inoculated with different genotypes of Phytophthora infestans (US-1, US-1.7, US-8, US-11 and US-14). The effect of these genotypes of P. infestans on seed piece rot severity after re-storage was assessed using an image analysis technique. P. infestans genotypes demonstrated variable ability to cause seed piece rot and to reduce plant emergence measured as final plant stand (%) and the relative area under the plant emergence curve (RAUEPC). The US-8 genotype of P. infestans was the most aggressive genotype, as indicated by tuber rot severity across all cultivars/ABLs tested, followed by US-14 in both years. The US-1, US-1.7 and US-11 genotypes were the least aggressive, causing only moderate seed piece rotting across cultivars/ABLs tested. Similar trends were observed in two field experiments, where the US-8 and US-14 genotypes delayed or reduced emergence. Values of final plant stand (%) and RAUEPC demonstrated that the cultivars/ABLs Atlantic, MSJ453-4Y and Torridon were the least susceptible across all P. infestans genotypes. In both experiments cv. Pike was the most susceptible. Other cultivars/ABLs demonstrated variable responses to different genotypes of P. infestans. No symptoms of P. infestans were observed on emerged plants up to 60 days after planting. The variability of susceptibility of tubers to different genotypes of P. infestans has implications for plant breeding efforts in that the major emphasis in the past has been to breed for foliar resistance, with limited emphasis on the reaction of the tuber. Results from this study suggest that highly aggressive genotypes of P. infestans such as US-8 may lead to severe tuber rotting and deterioration of tubers before emergence, but despite this observation the US-8 genotype is still predominant in North America.     

Inheritance of mefenoxam resistance in selfed populations of the homothallic oomycetePhytophthora erythroseptica (Pethybr.), cause of pink rot of potato

The inheritance of mefenoxam resistance in the oomycetePhytophthora erythroseptica, causal organism of pink rot of potato, was investigated in two successive selfed generations of single oospore isolates. Fourteen parental isolates from three mefenoxam-sensitivity phenotypes (sensitive, intermediately resistant, and resistant) were used to produce S1 and S2 progeny isolates by selfing each isolate and germinating single oospore cultures from each isolate. The two generations of isolates were tested for mefenoxam sensitivity using the radial growth inhibition assay and calculating EC₅₀ values. Twenty-four-hundred isolates from S1 and S2 generations were tested for mefenoxam sensitivity. Results demonstrated the lack of segregation for mefenoxam sensitivity among S1 and S2 progeny isolates from the resistant and sensitive parents. The majority of the S1 progeny isolates from the parents with intermediate resistance also possessed intermediate resistance, but demonstrated substantial quantitative shifts in response to mefenoxam more often toward increased insensitivity. A few isolates from the S1 progeny were sensitive to mefenoxam, and one isolate was mefenoxam-resistant. Similarly, the majority of the S2 progeny isolates from intermediately resistant parents also possessed intermediate resistance with some quantitative shifts in sensitivity to mefenoxam similar to those observed in S1 progeny, as well as a few isolates that were sensitive to mefenoxam. These results do not support the hypothesis that resistance to mefenoxam inP. erythroseptica is controlled by a single gene exhibiting incomplete dominance. Alternative hypotheses are proposed such as the genetics of mefenoxam resistance inP. erythroseptica is probably under the control of more than one major gene and perhaps some minor genes of additive effect.