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  • Author: D. Doyle x
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Assessment of water-limited winter wheat yield potential at spatially contrasting sites in Ireland using a simple growth and development model

Abstract

Although Irish winter wheat yields are among the highest globally, increases in the profitability of this crop are required to maintain its economic viability. However, in order to determine if efforts to further increase Irish wheat yields are likely to be successful, an accurate estimation of the yield potential is required for different regions within Ireland. A winter wheat yield potential model (WWYPM) was developed, which estimates the maximum water-limited yield achievable, within the confines of current genetic resources and technologies, using parameters for winter wheat growth and development observed recently in Ireland and a minor amount of daily meteorological input (maximum and minimum daily temperature, total daily rainfall and total daily incident radiation). The WWYPM is composed of three processes: (i) an estimation of potential green area index, (ii) an estimation of light interception and biomass accumulation and (iii) an estimation of biomass partitioning to grain yield. Model validation indicated that WWYPM estimations of water-limited yield potential (YPw) were significantly related to maximum yields recorded in variety evaluation trials as well as regional average and maximum farm yields, reflecting the model’s sensitivity to alterations in the climatic environment with spatial and seasonal variations. Simulations of YPw for long-term average weather data at 12 sites located at spatially contrasting regions of Ireland indicated that the typical YPw varied between 15.6 and 17.9 t/ha, with a mean of 16.7 t/ha at 15% moisture content. These results indicate that the majority of sites in Ireland have the potential to grow high-yielding crops of winter wheat when the effects of very high rainfall and other stresses such as disease incidence and nutrient deficits are not considered.

Open access
Crenosoma vulpis infection in a four-month old puppy

Summary

Here we report the case of a diagnostic and treatment challenge in a four-month old dog from England, presented with one-month history of unproductive cough. Antigen blood test for Angiostrongylus vasorum infection was negative. Thoracic radiographs revealed a generalised bronchointerstitial pattern and bronchoscopy showed moving nematodes in the mucus of the bronchial wall. Additionally, Baermann technique revealed a high burden of larvae per gram of faeces. Morphological and molecular analyses confirmed that they were first stage larvae of Crenosoma vulpis. The infection was firstly treated with a spot-on solution containing 10% imidacloprid + 2.5% moxidectin, but the dog was still positive after 13 days. Therefore, a seven-day course of fenbendazole was prescribed. This represents one of the youngest dogs ever reported naturally infected by C. vulpis. The scant number of reported cases of crenosomosis has led practitioners to consider it as a rare parasitic disease in dogs, delaying a correct and targeted on-time diagnosis. Further studies are needed to perceive the real prevalence of this lungworm and to understand if it is a rare parasite or just rarely diagnosed.

Open access