Howard F. Schwartz's Images
Title: Professor of Plant Pathology & Assoc. Dept. HeadOrganization: Colorado State University
Unit: Plant Pathology
Country: United States
Web: http://www.alliumnet.com/index.htm
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Howard F. Schwartz is a Professor of Plant Pathology & Associate Department Head in the Department of Bioagricultural Sciences and Pest Management at Colorado State University. His Research and Extension Interests include Integrated Pest Management (IPM) - particularly of rust and white mold of dry bean as well as bacterial diseases and Iris Yellow Spot Virus of onion. Specific areas include management by disease survey, a reporting network supported by GPS/GIS technology, disease resistance, cultural practices, and timely applications of pesticides in response to environmental monitoring and crop/pest modeling. He is also interested in making sure the delivery of time-sensitive information on Integrated Pest Management and Crop Production Systems is coordinated via traditional methods (newsletters, bulletins, alerts, meetings, field days) and via the internet (Legume Pipe, VegNet, Allium Net). He is also the person leading and coordinating the CSU Node of the Bugwood Network. |
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| 151 Images of 62 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5495122 | crystalline iceplant | Mesembryanthemum crystallinum | Mesembryanthemum crystallinum, invasive succulent weed, common names include iceplant, Hottentot fig, fig marigold |
| 5495123 | crystalline iceplant | Mesembryanthemum crystallinum | Mesembryanthemum crystallinum, invasive succulent weed, common names include iceplant, Hottentot fig, fig marigold |
| 5495124 | crystalline iceplant | Mesembryanthemum crystallinum | Mesembryanthemum crystallinum, invasive succulent weed, common names include iceplant, Hottentot fig, fig marigold |
| 5495125 | crystalline iceplant | Mesembryanthemum crystallinum | Mesembryanthemum crystallinum, invasive succulent weed, common names include iceplant, Hottentot fig, fig marigold |
| 5362603 | common sunflower | Helianthus annuus | Common sunflower (Helianthus annuus) growing as a weed in a field of dry beans. |
| 5473984 | buffalobur | Solanum rostratum | buffalobur plant in flower |
| 5473986 | buffalobur | Solanum rostratum | plant and flower characteristics of buffalobur |
| 5473985 | buffalobur | Solanum rostratum | plant and flower characteristics of buffalobur |
| 5473983 | buffalobur | Solanum rostratum | plant and flower characteristics of buffalobur |
| 5389463 | field bindweed | Convolvulus arvensis | A killdeer nest with eggs and a chick under a field bindweed. |
| 5389462 | field bindweed | Convolvulus arvensis | A killdeer nest with eggs and a chick under a field bindweed. |
| 5389460 | field bindweed | Convolvulus arvensis | A killdeer nest with eggs under a field bindweed. |
| 5389461 | field bindweed | Convolvulus arvensis | A killdeer nest with eggs under a field bindweed. |
| 5389459 | field bindweed | Convolvulus arvensis | A killdeer nest with eggs under a field bindweed. |
| 5362602 | showy milkweed | Asclepias speciosa | growing as a weed in dry beans. |
| 5362355 | showy milkweed | Asclepias speciosa | |
| 5358188 | field bindweed | Convolvulus arvensis | Field bindweed, Convolvulus arvensis, a common weed in agricultural and natural ecosystems. |
| 5358187 | foxtail barley | Hordeum jubatum | Foxtail barley, Hordeum jubatum, a common weed. |
| 5358186 | western salsify | Tragopogon dubius | Flowers of yellow salsify, Tragopogon dubius. |
| 5358185 | western salsify | Tragopogon dubius | Western salsify (Tragopogon dubius) growing as a weed in an alfalfa field. |
| 5359599 | puccinia rusts | Puccinia spp. | Aecia of rust (Puccinia sp.) on a thistle leaf. |
| 5364438 | Russian-thistle | Salsola tragus | Fruits and seeds |
| 5364418 | brome | Bromus spp. | Brome grass seed (Bromus sp.). |
| 5360859 | witchgrass | Panicum capillare | Witchgrass (Panicum capillare). |
| 5360601 | dodder | Cuscuta spp. | Dodder plants (Cuscuta sp.) growing over a carrot crop. |
| 5360599 | dodder | Cuscuta spp. | Dodder plants (Cuscuta sp.) growing over a carrot crop. |
| 5360600 | dodder | Cuscuta spp. | Dodder plants (Cuscuta sp.) growing over a carrot crop. |
| 5360598 | dodder | Cuscuta spp. | Dodder plants (Cuscuta sp.) growing over a carrot crop. |
| 5360596 | dodder | Cuscuta spp. | Dodder (Cuscuta sp.) infestation in a carrot field |
| 5360597 | dodder | Cuscuta spp. | Dodder (Cuscuta sp.) infestation in a carrot field |
| 5360595 | dodder | Cuscuta spp. | Dodder (Cuscuta sp.) infestation in a carrot field |
| 5360594 | dodder | Cuscuta spp. | Dodder (Cuscuta sp.) infestation in a carrot field. |
| 5362359 | yellow sweetclover | Melilotus officinalis | Yellow sweetclover (Melilotus officinalis) in bloom. |
| 5362358 | hairy vetch | Vicia villosa | Flowers of purple vetch (Vicia villosa). |
| 5362356 | clover | Trifolium spp. | Clover (Trifolium sp.) in bloom. |
| 5362348 | green foxtail | Setaria viridis | Inflorescence of green foxtail (Setaria viridis). |
| 5362347 | green foxtail | Setaria viridis | Green foxtail (Setaria viridis). |
| 5362346 | Mexican fireweed | Kochia scoparia | Young kochia plant (Kochia scoparia). |
| 5362345 | johnsongrass | Sorghum halepense | Johnsongrass (Sorghum halepense) -- a young plant. |
| 5362344 | black nightshade | Solanum nigrum | Young black nightshade plant (Solanum nigrum). |
| 5362343 | black nightshade | Solanum nigrum | Young black nightshade plant (Solanum nigrum). |
| 5362342 | longspine sandbur | Cenchrus longispinus | Sandbur (Cenchrus longispinus) -- close view of the inflorescence. |
| 5362341 | longspine sandbur | Cenchrus longispinus | Sandbur (Cenchrus longispinus) plant, showing the inflorescence. |
| 5362340 | longspine sandbur | Cenchrus longispinus | Sandbur (Cenchrus longispinus). |
| 5362338 | puncturevine | Tribulus terrestris | Puncturevine (Tribulus terrestris). |
| 5362339 | puncturevine | Tribulus terrestris | Puncturevine (Tribulus terrestris). |
| 5362337 | puncturevine | Tribulus terrestris | Puncturevine (Tribulus terrestris). |
| 5366064 | tall fescue | Festuca arundinacea | Tall fescue (Festuca arundinacea) growing as a weed along a road. |
| 5366065 | tall fescue | Festuca arundinacea | Tall fescue (Festuca arundinacea) growing as a weed along a road. |
| 5366030 | showy stonecrop | Hylotelephium spectabile | Showy stonecrop (Hylotelephium spectabile) -- an ornamental plant growing here as a weed. |
| 5365894 | common cattail | Typha latifolia | Dense stand of cattails (Typha latifolia). |
| 5365893 | common cattail | Typha latifolia | Patch of common cattail plants (Typha latifolia). |
| 5361782 | puncturevine | Tribulus terrestris | Puncturevine (Tribulus terrestris) -- close-up view of stem, leaves, and a flower. |
| 5361781 | puncturevine | Tribulus terrestris | Puncturevine (Tribulus terrestris) - plant with flowers. |
| 5361780 | puncturevine | Tribulus terrestris | Puncturevine (Tribulus terrestris). |
| 5361779 | puncturevine | Tribulus terrestris | Puncturevine (Tribulus terrestris). |
| 5364570 | common mallow | Malva neglecta | Common mallow plant (Malva neglecta). |
| 5364569 | wild mustard | Sinapis arvensis | Wild mustard (Sinapis arvensis, or Brassica kaber) in bloom. |
| 5364567 | musk thistle | Carduus nutans | Rosettes of musk thistle (Carduus nutans). |
| 5364568 | musk thistle | Carduus nutans | Seedlings of musk thistle (Carduus nutans). |
| 5364523 | giant ragweed | Ambrosia trifida | Young giant ragweed (Ambrosia trifida) plant. |
| 5364522 | lambsquarters | Chenopodium album | Seedlings of lambsquarters (Chenopodium album), with a seedling of common mallow (Malva neglecta) on the immediate right. |
| 5364521 | musk thistle | Carduus nutans | Rosettes of musk thistle (Carduus nutans). |
| 5364473 | dandelion | Taraxacum officinale | Dandelion (Taraxacum officinale) in bloom. |
| 5364445 | hoary cress | Lepidium draba | Seeds of whitetop (Cardaria draba). |
| 5364442 | hairy vetch | Vicia villosa | Seeds of hairy vetch (Vicia villosa). |
| 5364441 | common sunflower | Helianthus annuus | Seeds of wild sunflowers (Helianthus annuus). |
| 5364440 | sudangrass | Sorghum bicolor ssp. drummondii | Seeds of sudangrass (Sorghum bicolor drummondii). |
| 5364439 | longspine sandbur | Cenchrus longispinus | Seeds of sandbur (Cenchrus longispinus). |
| 5364437 | Russian knapweed | Rhaponticum repens | Seeds of Russian knapweed (Acroptilon repens). |
| 5364436 | quackgrass | Elymus repens | Seeds of quackgrass (Elytrigia repens). |
| 5364435 | puncturevine | Tribulus terrestris | Seeds of puncturevine (Tribulus terrestris). |
| 5364434 | redroot pigweed | Amaranthus retroflexus | Seeds of rough pigweed (Amaranthus retroflexus). |
| 5364433 | wild oat | Avena fatua | Seeds of wild oat (Avena fatua). |
| 5364432 | leafy spurge | Euphorbia esula | Seeds of leafy spurge (Euphorbia esula). |
| 5364431 | lambsquarters | Chenopodium album | Seeds of lambsquarters (Chenopodium album). |
| 5364430 | Mexican fireweed | Kochia scoparia | Seeds of kochia (Kochia scoparia). |
| 5364429 | jointed goatgrass | Aegilops cylindrica | Seeds of jointed goatgrass (Aegilops cylindrica). |
| 5364428 | johnsongrass | Sorghum halepense | Seeds of johnsongrass (Sorghum halepense). |
| 5364427 | green foxtail | Setaria viridis | Seeds of green foxtail (Setaria viridis). |
| 5364426 | field bindweed | Convolvulus arvensis | Seeds of field bindweed (Convolvulus arvensis). |
| 5364424 | curly dock | Rumex crispus | Seeds of curly dock (Rumex crispus). |
| 5364425 | dodder | Cuscuta spp. | Seeds of dodder (Cuscuta sp.). |
| 5364423 | castorbean | Ricinus communis | Seeds of castor bean (Ricinus communis). |
| 5364422 | Canada thistle | Cirsium arvense | Seeds of Canada thistle (Cirsium arvense). |
| 5364420 | buckhorn plantain | Plantago lanceolata | Seeds of buckhorn plantain (Plantago lanceolata). |
| 5364419 | cheatgrass | Bromus tectorum | Seeds of downy brome (Bromus tectorum). |
| 5364417 | barnyardgrass | Echinochloa crus-galli | Seeds of barnyardgrass (Echinocloa crus-galli). |
| 5363588 | tall morningglory | Ipomoea purpurea | Close-up view of the flowers of tall morningglory (Ipomoea purpurea). |
| 5363587 | tall morningglory | Ipomoea purpurea | Tall morningglory (Ipomoea purpurea). |
| 5363586 | tall morningglory | Ipomoea purpurea | Tall morningglory (Ipomoea purpurea). |
| 5362702 | dodder | Cuscuta spp. | Dodder plant (Cuscuta sp.) on weeds - field bindweed (Convolvulus arvensis) in the background. |
| 5359305 | cabbage collards and kale | Brassica oleracea | A variety of weed species growing among cabbage plants in a field. |
| 5359263 | dill | Anethum graveolens | Close-up view of buds, flowers and seeds of dill (Anethum graveolens). |
| 5358460 | Canada thistle | Cirsium arvense | Rosettes of Canada thistle (Cirsium arvense). |
| 5358459 | devil's-claw | Proboscidea louisianica | Close-up of drooping flowers and foliage of devil's claw (Proboscidea sp.). |
| 5358458 | devil's-claw | Proboscidea louisianica | Flower of devil's claw (Proboscidea sp.). |
| 5358457 | devil's-claw | Proboscidea louisianica | Devil's claw (Proboscidea sp.). |
| 5358325 | field bindweed | Convolvulus arvensis | Field bindweed (Convolvulus arvensis) in flower. |
| 5357630 | cattail | Typha spp. | Cattails (Typha sp.) growing in a waterway. |
| 5357629 | cattail | Typha spp. | Cattails (Typha sp.) growing in a waterway. |
| 5359865 | common bean | Phaseolus vulgaris | Canopy of bean plants with a weedy grass growing among them. |
| 5364444 | crested wheatgrass | Agropyron cristatum | Seeds of crested wheatgrass (Agropyron cristatum). |
| 5364421 | wild buckwheat | Fallopia convolvulus | Seeds of the weed, wild buckwheat (Polygonum convolvulus). |
| 5358371 | field pennycress | Thlaspi arvense | Seed pods of field pennycress (Thlaspi arvense) plants growing in a field of winter wheat. |
| 5358370 | field pennycress | Thlaspi arvense | Seed pods of field pennycress (Thlaspi arvense) plants growing in a field of winter wheat. |
| 5357240 | common sunflower | Helianthus annuus | Common sunflower (Helianthus annuus) growing as a weed in a field of winter wheat. |
| 5365377 | toothed spurge | Euphorbia dentata | Toothed spurge (Euphorbia dentata) growing as a weed in a dry bean field. |
| 5361787 | johnsongrass | Sorghum halepense | Close-up view of the flower head of johnsongrass (Sorghum halepense) emerging from the boot. Plant is growing in a field of dry beans. |
| 5361786 | johnsongrass | Sorghum halepense | Johnsongrass (Sorghum halepense) growing as a weed in a field of dry beans. |
| 5361785 | Mexican fireweed | Kochia scoparia | Kochia (Kochia scoparia) plant growing in a field of dry beans. |
| 5361611 | toothed spurge | Euphorbia dentata | View of the underside of a leaf of toothed spurge (Euphorbia dentata), showing symptoms of rust. The plant is growing as a weed in a field of dry beans. |
| 5361609 | black nightshade | Solanum nigrum | Black nightshade (Solanum nigrum) growing as a weed in a field of dry beans. |
| 5361610 | black nightshade | Solanum nigrum | Black nightshade (Solanum nigrum) growing as a weed in a field of dry beans. |
| 5361608 | buffalobur | Solanum rostratum | Buffalobur (Solanum rostratum) plants growing as weeds in a bean field. |
| 5363867 | velvetleaf | Abutilon theophrasti | Velvetleaf (Abutilon theophrasti) growing as a weed in a dry bean field. |
| 5363866 | velvetleaf | Abutilon theophrasti | Velvetleaf (Abutilon theophrasti), as well as pigweed (Amaranthus retroflexus), growing as weeds in a dry bean field. |
| 5362606 | field bindweed | Convolvulus arvensis | Field bindweed (Convolvulus arvensis) growing as a weed among dry bean plants. |
| 5362605 | Mexican fireweed | Kochia scoparia | Kochia plant (Kochia scoparia) growing as a weed in a field of dry beans. |
| 5362604 | Mexican fireweed | Kochia scoparia | Kochia (Kochia scoparia) growing as a weed among dry beans. |
| 5362601 | woollyleaf bursage | Ambrosia grayi | Wollyleaf bursage (Ambrosia grayi) growing as a weed among dry bean plants. |
| 5362600 | lambsquarters | Chenopodium album | Lambsquarters (Chenopodium album) growing as a weed in a dry bean field. |
| 5362599 | common purslane | Portulaca oleracea | Purslane (Portulaca oleracea) growing as a weed in a field of dry beans. |
| 5362598 | black nightshade | Solanum nigrum | Black nightshade (Solanum nigrum) growing as a weed in a field of dry bean plants. |
| 5362597 | Virginia groundcherry | Physalis virginiana | Ground cherry (Physalis virginiana) growing as a weed among dry bean plants. |
| 5362596 | johnsongrass | Sorghum halepense | Johnsongrass (Sorghum halepense) growing as a weed in a field of dry beans. |
| 5362595 | toothed spurge | Euphorbia dentata | Toothed spurge (Euphorbia dentata) growing as a weed among dry bean plants. |
| 5362594 | toothed spurge | Euphorbia dentata | Toothed spurge (Euphorbia dentata) growing as a weed in a dry bean field. |
| 5362593 | lanceleaf sage | Salvia reflexa | Lanceleaf sage (Salvia reflexa) growing as a weed among dry beans. |
| 5362592 | redroot pigweed | Amaranthus retroflexus | Redroot pigweed (Amaranthus retroflexus) growing as a weed in a field of dry beans. |
| 5362591 | buffalobur | Solanum rostratum | Buffalobur (Solanum rostratum) growing as a weed among dry beans. |
| 5362590 | buffalobur | Solanum rostratum | Buffalobur (Solanum rostratum) -- and the flower of puncturevine (Tribulus terrestris) -- growing as weeds in a dry bean field. |
| 5358977 | common bean | Phaseolus vulgaris | Weeds sprouting as a result of no carryover of herbicides applied in a dry bean field. |
| 5362322 | garden onion | Allium cepa | Onion plants infested with black nightshade, Solanum nigrum. |
| 5362321 | garden onion | Allium cepa | Onion plants being smothered by field bindweed, Convolvulus arvensis. |
| 5362320 | garden onion | Allium cepa | Puncturevine (Tribulus terrestris) growing among onion plants. |
| 5362319 | garden onion | Allium cepa | Velvetleaf seedling (Abutilon theophrasti), a weed among onions. |
| 5366487 | yellow nutsedge | Cyperus esculentus | Yellow nutsedge (Cyperus esculentus) growing in an onion field. |
| 5359275 | yellow nutsedge | Cyperus esculentus | Overview of mature ellow nutsedge (Cyperus esculentus) plants growing in an onion field. |
| 5359274 | yellow nutsedge | Cyperus esculentus | Yellow nutsedge (Cyperus esculentus) growing in onions. |
| 5359273 | yellow nutsedge | Cyperus esculentus | Yellow nutsedge (Cyperus esculentus) growing in onions. |
| 5358456 | johnsongrass | Sorghum halepense | Johnsongrass (Sorghum halepense) seedlings in an onion field. |
| 5358454 | johnsongrass | Sorghum halepense | Johnsongrass (Sorghum halepense) seedlings in an onion field. |
| 5358455 | johnsongrass | Sorghum halepense | Johnsongrass (Sorghum halepense) seedlings in an onion field. |
| 5358448 | chufa flatsedge | Cyperus esculentus var. leptostachyus | Yellow nutsedge (Cyperus esculentus) growing as a weed in an onion field. |
| 5358449 | chufa flatsedge | Cyperus esculentus var. leptostachyus | Yellow nutsedge (Cyperus esculentus) growing as a weed in an onion field. |
| 5358450 | chufa flatsedge | Cyperus esculentus var. leptostachyus | Yellow nutsedge (Cyperus esculentus) growing as a weed in an onion field. |
| 5358451 | chufa flatsedge | Cyperus esculentus var. leptostachyus | Yellow nutsedge (Cyperus esculentus) growing as a weed in an onion field. |
| 5358452 | chufa flatsedge | Cyperus esculentus var. leptostachyus | Yellow nutsedge (Cyperus esculentus) growing as a weed in an onion field. |
| 5358453 | chufa flatsedge | Cyperus esculentus var. leptostachyus | Tubers of yellow nutsedge (Cyperus esculentus) growing as a weed in an onion field. |
| 5358447 | chufa flatsedge | Cyperus esculentus var. leptostachyus | Yellow nutsedge (Cyperus esculentus) growing as a weed in an onion field. |
