David Doll
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View article: Chemical and toxicological study of extracts from the stem bark of Uapaca thouarsii Baill. (Phyllanthaceae), a medicinal plant endemic to Madagascar
Chemical and toxicological study of extracts from the stem bark of Uapaca thouarsii Baill. (Phyllanthaceae), a medicinal plant endemic to Madagascar Open
The aim of this study was to assess on different organisms the toxicity of extracts from the stem bark of Uapaca thouarsii, a medicinal plant endemic to Madagascar. An aqueous crude extract (CE) was prepared from bark powder. CE was succes…
View article: Winter flooding recharges groundwater in almond orchards with limited effects on root dynamics and yield
Winter flooding recharges groundwater in almond orchards with limited effects on root dynamics and yield Open
California signed the Sustainable Groundwater Management Act (SGMA) into law in 2014. SGMA requires groundwater-dependent regions to halt overdraft and develop plans to reach an annual balance of pumping and recharge. Groundwater aquifers …
View article: Orchard recycling improves climate change adaptation and mitigation potential of almond production systems
Orchard recycling improves climate change adaptation and mitigation potential of almond production systems Open
There is an urgent need to develop climate smart agroecosystems capable of mitigating climate change and adapting to its effects. In California, high commodity prices and increased frequency of drought have encouraged orchard turnover, pro…
View article: Assessing Feeding Damage from Two Leaffooted Bugs, Leptoglossus clypealis Heidemann and Leptoglossus zonatus (Dallas) (Hemiptera: Coreidae), on Four Almond Varieties
Assessing Feeding Damage from Two Leaffooted Bugs, Leptoglossus clypealis Heidemann and Leptoglossus zonatus (Dallas) (Hemiptera: Coreidae), on Four Almond Varieties Open
Leaffooted bugs (Leptoglossus spp; Hemiptera: Coreidae) are phytophagous insects native to the Western Hemisphere. In California, Leptoglossus clypealis and Leptoglossus zonatus are occasional pests on almonds. Early season feeding by L. c…
View article: Identification and Pathogenicity of Fungal Species Associated with Canker Diseases of Pistachio in California
Identification and Pathogenicity of Fungal Species Associated with Canker Diseases of Pistachio in California Open
A survey was conducted during 2015 and 2016 in pistachio orchards throughout the San Joaquin Valley of California to investigate the occurrence of canker diseases and identify the pathogens involved. Cankers and dieback symptoms were obser…
View article: Characterization of<i>Fusarium</i>and<i>Neocosmospora</i>Species Associated With Crown Rot and Stem Canker of Pistachio Rootstocks in California
Characterization of<i>Fusarium</i>and<i>Neocosmospora</i>Species Associated With Crown Rot and Stem Canker of Pistachio Rootstocks in California Open
California produces 99.1% of pistachios grown in the United States, and diseases affecting pistachio rootstocks represent a constant challenge to the industry. Field surveys of fungi associated with pistachio rootstocks with symptoms of cr…
View article: The effect of fumigation on nematode communities in California almond orchards
The effect of fumigation on nematode communities in California almond orchards Open
Summary Fumigants, such as 1,3-dichloropropene and chloropicrin, have become key to pre-plant pest management in almond production. Whilst the use of these fumigants has become increasingly restricted due to human health concerns, less is …
View article: First Report of the Peach Root-Knot Nematode, <i>Meloidogyne floridensis</i> Infecting Almond on Root-Knot Nematode Resistant ‘Hansen 536’ and ‘Bright's Hybrid 5’ Rootstocks in California, USA
First Report of the Peach Root-Knot Nematode, <i>Meloidogyne floridensis</i> Infecting Almond on Root-Knot Nematode Resistant ‘Hansen 536’ and ‘Bright's Hybrid 5’ Rootstocks in California, USA Open
In April-August 2018, samples of galled roots with rhizosphere soil were collected from almond orchards in Atwater, Merced County and Bakersfield, Kern County, California. Almond trees ( Prunus dulcis ) grafted on ‘Hansen 536’ and ‘Brights…
View article: Abstracts of Presentations at the 2016 Pacific Division Meeting
Abstracts of Presentations at the 2016 Pacific Division Meeting Open
Crown gall and leafy gall disease caused by phytopathogenic Agrobacterium tumefaciens and Rhodococcus, respectively, are a significant, costly, and chronic problem in the ornamentals nursery industry.Crown gall has been particularly troubl…
View article: More Reliable Crop Water Stress Quantification Using Small Unmanned Aerial Systems (sUAS)**This work is supported in part by UC ANR Competitive Grant Award No. 13-2628 (2014-2019) entitled Evaluating and extending the use of small, multi-rotor unmanned aerial vehicles (UAVs) as a crop monitoring tool.
More Reliable Crop Water Stress Quantification Using Small Unmanned Aerial Systems (sUAS)**This work is supported in part by UC ANR Competitive Grant Award No. 13-2628 (2014-2019) entitled Evaluating and extending the use of small, multi-rotor unmanned aerial vehicles (UAVs) as a crop monitoring tool. Open
The remarkable development of small unmanned aerial systems (sUAS) and imaging payloads have made it easier to monitor the crops with higher spatial resolution and temporal resolution images. As a crop based water status index, stem water …
View article: Biological control program is being developed for brown marmorated stink bug
Biological control program is being developed for brown marmorated stink bug Open
Brown marmorated stink bug (BMSB) is an invasive, polyphagous pest that has been detected in 42 U.S. states. In 2010, it caused millions of dollars in crop damages to apple growers on the East Coast, where it arrived from Asia during the 1…
View article: The Role of Pest Control Advisers in Preventative Management of Grapevine Trunk Diseases
The Role of Pest Control Advisers in Preventative Management of Grapevine Trunk Diseases Open
Vineyards with trunk diseases (Botryosphaeria dieback, Esca, Eutypa dieback, and Phomopsis dieback) can have negative returns in the long run. Minimizing economic impacts depends on effective management, but adopting a preventative practic…
View article: Drought Tip: Drought Management for California Almonds
Drought Tip: Drought Management for California Almonds Open
A lmond trees are tolerant to drought conditions and respond to water availability with increasing yields.Research has shown that trees are able to survive on as little as 7.6 inches of water (Shackel et al. 2011), but they produce maximal…
View article: Soil suitability index identifies potential areas for groundwater banking on agricultural lands
Soil suitability index identifies potential areas for groundwater banking on agricultural lands Open
Groundwater pumping chronically exceeds natural recharge in many agricultural regions in California. A common method of recharging groundwater — when surface water is available — is to deliberately flood an open area, allowing water to per…