Picture of the Week
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Plant and Pest Diagnostic Laboratory
Purdue University
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West Lafayette IN 47907-2054
Email: ppdl-samples@purdue.edu
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Picture of the Week Archive
Scroll down to search by subject matter.
2022
- Arborvitae - Black Flags (27 Jun 2022) - Tom Creswell
- Tulip Leaf Drop - No Cause For Alarm (20 Jun 2022) - Gail Ruhl
- Chinese Elm (13 Jun 2022) - Rosie Lerner
- Powdery Mildews - NOT ALL THE SAME (6 Jun 2022) - Gail Ruhl
- Fertilizer Application, Don't Get Burned! (30 May 2022) - John Orick
- Lettuce Drop (23 May 2022) - Dan Egel
- Anthracnose of Shade Trees or Wind Injury (16 May 2022) - Gail Ruhl
- Palmer amaranth (Amaranthus palmeri) (9 May 2022) - Marcelo Zimmer
- Fusarium crown and root rot of tomato (2 May 2022) - Dan Egel
- Jade Plant Can Sunburn (25 Apr 2022) - Rosie Lerner
- Spring Has Sprung and Mowing Has Begun! (18 Apr 2022) - John Orick
- Protect Early Planted Warm-Season Vegetables From Low Temperatures (11 Apr 2022) - Wenjing Guan
- Seeing swarms of Honey Bees is a Good Thing (4 Apr 2022) - Tim Gibb
- Proactive protection of fruit (28 Mar 2022) - Janna Beckerman
- Tomato spotted wilt virus (21 Mar 2022) - Dan Egel
- Taphrina Leaf Curl on Flowering Peaches and Nectarines (14 Mar 2022) - Gail Ruhl
- Fungal Pressure (7 Mar 2022) - Dan Egel
- Plan Now for Garden and Flower Bed Sanitation (28 Feb 2022) - Gail Ruhl
- Foxtails (21 Feb 2022) - Marcelo Zimmer
- Sub-lethal Glyphosate Injury in Ornamentals (14 Feb 2022) - Kyle Daniel
- Rhododendron Dessication (7 Feb 2022) - Rosie Lerner
- Spring Seeding Lawns: Is it Really the Best Option? (31 Jan 2022) - John Orick
- The Perfect Valentine's Day Gift (24 Jan 2022) - Rosie Lerner
- Powdery Mildew on Houseplants (17 Jan 2022) - Gail Ruhl
- Daikon Radish (10 Jan 2022) - Wenjing Guan
- Distinguishing Hemlock from Yew (3 Jan 2022) - Rosie Lerner
2021
- Dealing with Perennial Grassy Weeds in Home Lawns (27 Dec 2021) - John Orick
- The Other Mistletoe (20 Dec 2021) - Janna Beckerman
- Henbit and purple deadnettle: common winter annual weeds in Indiana (13 Dec 2021) - Marcelo Zimmer
- Mowing and Leaf Removal (6 Dec 2021) - John Orick
- Bare Spots in the Lawn Left Behind by Summer Annuals (29 Nov 2021) - Glenn Hardebeck
- Poinsettia Plant - Is it poisonous to Pets? (22 Nov 2021) - Rosie Lerner
- Winter Lawn Care Tips (15 Nov 2021) - John Orick
- The Wire Basket Conundrum (8 Nov 2021) - Kyle Daniel
- Anthracnose of tomato (1 Nov 2021) - Dan Egel
- Cover Crops & Integrated Weed Management (25 Oct 2021) - Marcelo Zimmer
- Fine Fescue: The Future of Low Input Grass? (18 Oct 2021) - John Orick and Ross Braun
- Chestnut weevils (11 Oct 2021) - Bruce Bordelon
- Curved Cucumbers (14 Oct 2021) - Wenjing Guan
- Flower With a View (27 Sep 2021) - Dan Egel
- Fountain Grass, a Tough Weed in Turf (20 Sep 2021) - John Orick
- Hallowheart of Watermelons (13 Sep 2021) - Wenjing Guan
- Mosquitos and Disease (1 Sep 2021) - Tim Gibb
- Why Accurate Specimen Diagnosis is the first Step in Managing Pest (17 Aug 2021) - Tim Gibb
- Grassy weeds becoming obvious in dormant turf issues. (9 Aug 2021) - Glenn Hardebeck
- Hummingbird - no wait - it's a moth! (26 Jul 2021) - Tim Gibb
- Symptoms Associated With Low Soil pH in Corn (19 Jul 2021) - Bob Nielsen
- Lettuce Bolting (12 Jul 2021) - Rosie Lerner
- Volutella Leaf Blight on Pachysandra (14 Jun 2021) - Gail Ruhl
- Carpenter bees: What's that buzzing around your porch? (7 June 2021) - Elizabeth Barnes
- Clover Mites in the Home (24 May 2021) - Tim Gibb
- Controlling Ground Ivy (Creeping Charlie)??? (17 May 2021) - Glenn Hardebeck
- It's May, So its Mayapple Season (10 May 2021) - Glenn Nice
- Diagnosing Herbicide Injury on Field Crops (3 May 2021) - Marcelo Zimmer
- Smooth Patch (26 Apr 2021) - Karen Rane
- Pigweed Identification (19 Apr 2021) - Marcelo Zimmer
- Rhubarb (12 Apr 2021) - Rosie Lerner
- Reduce Defoliation From Rose Black Spot (4 Apr 2021) - Gail Ruhl
- Do you have Wild Onion in your lawn? Or possibly the Star-of-Bethlehem?? (29 Mar 2021) - Glenn Hardebeck
- Chlorosis of pine trees (22 Mar 2021) - Tom Creswell
- Fruit bud survival this winter. (15 Mar 2021) - Bruce Bordelon
- Southwest Injury of Trees (8 Mar 2021) - Kyle Daniel
- Holes in Trees Are Not Always the Work of Insects (1 Mar 2021) - Tim Gibb
- Fall Emerging Marestail: The lurking pest in your no-till soybean field (22 Feb 2021) - Marcelo Zimmer
- Mouse, vole and rabbit damage to fruit plants. (15 Feb 2021) - Bruce Bordelon
- Mushroom Gardening (8 Feb 2021) - Janna Beckerman
- Purdue Extension Master Gardeners Help Others Grow! (21 Jan 2021) - John Orick
- The Purdue Plant and Pest Diagnostic Lab - Ready to Serve You (12 Jan 2021) - Tom Creswell
Search by Subject
- Palmer amaranth (Amaranthus palmeri) (9 May 2022) - Marcelo Zimmer
- Foxtails (21 Feb 2022) - Marcelo Zimmer
- Henbit and purple deadnettle: common winter annual weeds in Indiana (13 Dec 2021) - Marcelo Zimmer
- Cover Crops & Integrated Weed Management (25 Oct 2021) - Marcelo Zimmer
- Symptoms Associated With Low Soil pH in Corn (19 Jul 2021) - Bob Nielsen
- Diagnosing Herbicide Injury on Field Crops (3 May 2021) - Marcelo Zimmer
- Pigweed Identification (19 Apr 2021) - Marcelo Zimmer
- Fall Emerging Marestail: The lurking pest in your no-till soybean field (22 Feb 2021) - Marcelo Zimmer
- Powdery Mildews - NOT ALL THE SAME (6 Jun 2022) - Gail Ruhl
- Jade Plant Can Sunburn (25 Apr 2022) - Rosie Lerner
- Plan Now for Garden and Flower Bed Sanitation (28 Feb 2022) - Gail Ruhl
- The Perfect Valentine's Day Gift (24 Jan 2022) - Rosie Lerner
- Powdery Mildew on Houseplants (17 Jan 2022) - Gail Ruhl
- Poinsettia Plant - Is it poisonous to Pets? (22 Nov 2021) - Rosie Lerner
- Volutella Leaf Blight on Pachysandra (14 Jun 2021) - Gail Ruhl
- It's May, So its Mayapple Season (10 May 2021) - Glenn Nice
- Reduce Defoliation From Rose Black Spot (4 Apr 2021) - Gail Ruhl
- Powdery Mildews - NOT ALL THE SAME (6 Jun 2022) - Gail Ruhl
- Lettuce Drop (23 May 2022) - Dan Egel
- Fusarium crown and root rot of tomato (2 May 2022) - Dan Egel
- Protect Early Planted Warm-Season Vegetables From Low Temperatures (11 Apr 2022) - Wenjing Guan
- Proactive protection of fruit (28 Mar 2022) - Janna Beckerman
- Tomato spotted wilt virus (21 Mar 2022) - Dan Egel
- Taphrina Leaf Curl on Flowering Peaches and Nectarines (14 Mar 2022) - Gail Ruhl
- Daikon Radish (10 Jan 2022) - Wenjing Guan
- Anthracnose of tomato (1 Nov 2021) - Dan Egel
- Curved Cucumbers (14 Oct 2021) - Wenjing Guan
- Flower With a View (27 Sep 2021) - Dan Egel
- Hallowheart of Watermelons (13 Sep 2021) - Wenjing Guan
- Lettuce Bolting (12 Jul 2021) - Rosie Lerner
- Rhubarb (12 Apr 2021) - Rosie Lerner
- Fruit bud survival this winter. (15 Mar 2021) - Bruce Bordelon
- Mouse, vole and rabbit damage to fruit plants. (15 Feb 2021) - Bruce Bordelon
- Mushroom Gardening (8 Feb 2021) - Janna Beckerman
- Seeing Swarms of Honey Bees is a Good Thing (4 Apr 2022) - Tim Gibb
- Mosquitos and Disease (1 Sep 2021) - Tim Gibb
- Why Accurate Specimen Diagnosis is the first Step in Managing Pest (17 Aug 2021) - Tim Gibb
- Hummingbird - no wait - it's a moth! (26 Jul 2021) - Tim Gibb
- Carpenter bees: What's that buzzing around your porch? (7 June 2021) - Elizabeth Barnes
- Clover Mites in the Home (24 May 2021) - Tim Gibb
- Holes in Trees Are Not Always the Work of Insects (1 Mar 2021) - Tim Gibb
- Arborvitae - Black Flags (27 Jun 2022) - Tom Creswell
- Tulip Leaf Drop - No Cause For Alarm (20 Jun 2022) - Gail Ruhl
- Chinese Elm (13 Jun 2022) - Rosie Lerner
- Anthracnose of Shade Trees or Wind Injury (16 May 2022) - Gail Ruhl
- Fungal Pressure (7 Mar 2022) - Dan Egel
- Sub-lethal Glyphosate Injury in Ornamentals (14 Feb 2022) - Kyle Daniel
- Rhododendron Dessication (7 Feb 2022) - Rosie Lerner
- Distinguishing Hemlock from Yew (3 Jan 2022) - Rosie Lerner
- The Other Mistletoe (20 Dec 2021) - Janna Beckerman
- The Wire Basket Conundrum (8 Nov 2021) - Kyle Daniel
- Chestnut weevils (11 Oct 2021) - Bruce Bordelon
- Smooth Patch (26 Apr 2021) - Karen Rane
- Chlorosis of pine trees (22 Mar 2021) - Tom Creswell
- Southwest Injury of Trees (8 Mar 2021) - Kyle Daniel
- Fertilizer Application, Don't Get Burned! (30 May 2022) - John Orick
- Spring Has Sprung and Mowing Has Begun! (18 Apr 2022) - John Orick
- Spring Seeding Lawns: Is it Really the Best Option? (31 Jan 2022) - John Orick
- Dealing with Perennial Grassy Weeds in Home Lawns (27 Dec 2021) - John Orick
- Mowing and Leaf Removal (6 Dec 2021) - John Orick
- Bare Spots in the Lawn Left Behind by Summer Annuals (29 Nov 2021) - Glenn Hardebeck
- Winter Lawn Care Tips (15 Nov 2021) - John Orick
- Fine Fescue: The Future of Low Input Grass? (18 Oct 2021) - John Orick and Ross Braun
- Fountain Grass, a Tough Weed in Turf (20 Sep 2021) - John Orick
- Grassy weeds becoming obvious in dormant turf issues. (9 Aug 2021) - Glenn Hardebeck
- Controlling Ground Ivy (Creeping Charlie)??? (17 May 2021) - Glenn Hardebeck
- Do you have Wild Onion in your lawn? Or possibly the Star-of-Bethlehem?? (29 Mar 2021) - Glenn Hardebeck
- Purdue Extension Master Gardeners Help Others Grow! (21 Jan 2021) - John Orick
- The Purdue Plant and Pest Diagnostic Lab - Ready to Serve You (12 Jan 2021) - Tom Creswell
Have a question about a topic you are not seeing in the archive?
we've had to remove older articles for the new site.
Email us at ppdl-samples@purdue.edu and we will try to create a new article to answer your questions.
