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Finding the safe planting window for blackspot
No full textThe Blackspot Manager disease risk forecaster model is an effective tool to help identify the best balance between early sowing and potential yield loss from blackspot. Blackspot can lead to significant crop losses. Field peas become infected when windborne spores are released from fruiting bodies on infected stubble. The timing of spore release is generally early in autumn, depending on summer and autumn rain events
Capeweed and its management
No full textCapeweed (Arctotheca calendula) is a prostrate, stemless, sprawling annual herb that germinates during autumn and winter. In Western Australia (WA), competition from 7 to 90 capeweed plants per square metre in a wheat crop can reduce crop yield by 28 to 44% and net return by 25 to 76%
Barley and cereal yellow dwarf viruses and their management
No full textBarley yellow dwarf viruses (BYDV) and cereal yellow dwarf viruses (CYDV) damage cereal crops worldwide. These yellow dwarf viruses infect wheat, barley, oats and grasses and are transmitted by aphids.
This page describes these collective yellow dwarf viruses (barley and cereal yellow dwarf viruses), which damage cereals crops and advises on their diagnosis, monitoring, and management the viruses in the Western Australian (WA) grainbelt.
Growers are encouraged to check cereal crops for aphids on a regular basis, especially early in the season during autumn when winged aphids migrate into cereal crops during the crops’ most vulnerable growth phase. Early detection of the aphid vectors will allow management decisions to be made to minimise potential yield and quality losses
Lure specificity, phenology, and damage caused by Epiphyas moths (Lepidoptera: Tortricidae) in Western Australian apple orchards
No full textMultiple Epiphyas species inhabit southwestern Western Australia, including Light Brown Apple Moth (LBAM) Epiphyas postvittana (Walker) (Lepidoptera: Tortricidae), a globally significant, polyphagous pest. This study evaluated the efficacy and specificity of lures designed for 3 Epiphyas species: E. postvittana, Epiphyas pulla (Turner), and the undescribed Epiphyas sp. (1) (Common). Additionally, the study sought to determine the presence and distribution of Epiphyas species in 3 significant apple-growing localities. Trapping, together with partial sequencing of the mitochondrial COI gene, found LBAM to be restricted to the Perth Hills and E. pulla, to apple orchards near Manjimup and Pemberton. This geographic disjunction remains unexplained. Epiphyas sp. (1) was not recorded despite using a specifically designed lure. The E. pulla and LBAM traps demonstrated superior efficacy in capturing their target species, while the catch in Epiphyas sp. (1) traps did not significantly differ between the 2. Both E. pulla and LBAM exhibited peak abundance from late spring to the end of summer (October–February), with variations in timing and peak catch of male moths across species, locations, and years. Surveys conducted in April during the harvest period (February–May), when moth traps caught an average of 1–1.8 moths/trap/week, found no Epiphyas larvae or damage on 140,400 mature apples or on 26,000 leaves. While E. pulla and LBAM traps effectively monitor their target moths, genetic identification of trap catch would be necessary if they co-occurred. Encouragingly, the results indicate that both species become relatively rare as harvest season approaches, and neither inflicts significant damage to mature apples under existing management
Identifying high-value tactical livestock decisions on a mixed enterprise farm in a variable environment
No full textContext
Australia is renowned for its climate variation, featuring years with drought and years with floods, which result in significant production and profit variability. Accordingly, to maximise profitability, dryland farming systems need to be dynamically managed in response to unfolding weather conditions.
Aims
The aim of this study is to identify and quantify optimal tactical livestock management for different weather-years.
Methods
This study employed a whole-farm optimisation model to analyse a representative mixed enterprise farm located in the Great Southern region of Western Australia. Using this model, we investigated the economic significance of five key livestock management tactics. These included timing of sheep sales, pasture-area adjustments, rotational grazing, crop grazing and sheep nutrition adjustments.
Key results
The results showed that, on the modelled dryland mixed-enterprise farm in the Great Southern region of Western Australia, short-term adjustments to the overall farm strategy in response to unfolding weather conditions increased expected profit by approximately 16%. Each tactic boosted profit by between A53,171. However, we outline several complexities that farmers must consider when implementing tactics.
Conclusions
The financial gains from short-term tactical management highlighted their importance and farmers’ need to develop and apply those skills. The tactical skills promote business resilience and adaptability in the face of climate uncertainties.
Implications
The study highlighted the economic value of dynamic livestock management in response to climate variations, offering farmers in the Great Southern region the means to underpin profitable and sustainable farm practices
ICES Roadmap for Marine Recreational Fisheries (MRF)
No full textPurpose of the roadmap
The overarching goal of this roadmap is to guide the development of robust marine recreational fisheries (MRF) assessments through data and methodological improvements, in line with current and future management needs. To address the requirements of the policy and legislative instruments in relation to MRF and to plan future steps in ICES, there is need to further improve and operationalize the required MRF dataflows and assessment procedures. Better integration of MRF into advice is in line with ICES vision and mission alongside its advisory framework and principles. This will assist not only managers but also the angling community, fishing industry, and environmental NGOs in implementation of the relevant legislative instruments.
ICES Technical Report, Contributors (Authors)
Kieran Hyder; Zachary Radford; Fabio Grati; Bruce Hartill; Colm Lordan; Joanne Morgan; Henn Ojaveer; Karina Ryan; Lara Salvany; Harry Strehlow; Paul Venturelli; Jon Helge Volstad; Estanis Mugerza
WA Insecticide Guide 2024 - Winter Spring
No full textThe insecticides listed in the tables within this guide can be used on any crop appearing on the chemical label, if the rate used does not exceed the highest rate that is registered for use on that crop.
There are many products with different trade names that contain the same active ingredient. This list is not exhaustive and does not imply any specific recommendations of brand names.https://library.dpird.wa.gov.au/fc_pestfactswa/1022/thumbnail.jp
BEN Signage Installation Map - Shire of Carnarvon (south)
No full textBeach Emergency Number (BEN) - Shire of Carnarvon (south)https://library.dpird.wa.gov.au/gis_bens/1055/thumbnail.jp
Exact testing for heteroscedasticity in a two-way layout in variety frost trials when incorporating a covariate
No full textTwo-way layouts are common in grain industry research where it is often the case that there are one or more covariates. It is widely recognised that when estimating fixed effect parameters, one should also examine for possible extra error variance structure. An exact test for heteroscedasticity, when there is a covariate, is illustrated for a data set from frost trials in Western Australia. While the general algebra for the test is known, albeit in past literature, there are computational aspects of implementing the test for the two way when there are covariates. In this scenario the test is shown to have greater power than the industry standard, and because of its exact size, is preferable to use of the restricted maximum likelihood ratio test (REMLRT) based on the approximate asymptotic distribution in this instance. Formulation of the exact test considered here involves creation of appropriate contrasts in the experimental design. This is illustrated using specific choices of observations corresponding to an index set in the linear model for the two-way layout. Also an algorithm supplied complements the test. Comparisons of size and power then ensue. The test has natural extensions when there are unbalanced data, and more than one covariate may be present. Results can be extended to Balanced Incomplete Block Designs
Mid West Development Commission
No full textMid West Development Commission boundaryhttps://library.dpird.wa.gov.au/gis_maps/1047/thumbnail.jp