@hgpennington

Plant pathogen paintings & photos

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In 2022 I painted Alternaria leaf spot on cabbage and potato scab, caused by Streptomyces spp. www.hgpenningtonart.... @NeilGud pointed out that the potato lesions may be black scurf, as the lesions are raised x.com/NeilGud/status...

Alternaria: a simplified green cabbage leaf with pale green veins. Symptoms shown are round, brown spots with concentric rings and a yellow halo surrounding the lesion. Streptomyces: three simplified potatoes, with raised, rough patches of dark brown skin.

@hgpennington@hgpennington· Jul 13

In 2024 I challenged myself to complete one drawing each day whilst on holiday in Japan. Tram hgpenningtonart.com/...

A tram, viewed at an angle, draw in in biro on white paper

@hgpennington@hgpennington· Jul 12

I’m pleased to share my third Society of Botanical Artists Diploma coursework🎨 Assignment 3a focused on mixing greens and painting leaves. I chose a varied selection of leaves with different shapes, colours, and textures. See more: hgpenningtonart.co.u...

Seven leaves drawn in coloured pencil on white paper. One leaf is red, one yellow and brown, and five predominantly green. One of the green leaves is a long blade of grass, which leads the viewer around the page

@hgpennington@hgpennington· Jul 9

In 2025 I painted symptoms of Arabidopsis downy mildew infection, caused by Hyaloperonospora arabidopsidis on a juvenile Arabidopsis leaf. This artwork was commissioned for Professor Jonathan Jones’ retirement seminar and featured on the invitations. hgpenningtonart.com/...

The painting shows a single, bright green, round leaf. Conidiophores cover the surface, illustrated as white round shapes (conidia) at the tips of black lines (conidiophore stems, branches and metulae). The overall effect resembles a mouldy green table tennis racket.

@hgpennington@hgpennington· Jul 8

In 2022 I painted grapevine red blotch virus (GRBV) symptoms. www.hgpenningtonart.... The National Grape Research Alliance asked for permission to use this painting in their January 2023 newsletter! myemail.constantcont...

A picture of a simplified flat green leaf, with a black outline and details picked out in red, painted on a white background.

@hgpennington@hgpennington· Jul 7

In 2023 I painted a wheat stem rust teleutosorus (pustule). My painting won the ‘Magnified’ section of the 2023 @plantpathgrads Art competition tinyurl.com/yjfhc7cn and @YOGESHD23825337 made my painting into a cake tinyurl.com/5n726ta6 www.hgpenningtonart....

The painting shows a teleutosorus (or sori) on a wheat stem. A chain of ruptured epidermal cells visible on either side of the teleutospores. Below the teleutospores, there is a mass of hyphae amongst the host cells.

A vascular bundle is present to the left of the fungal lesion. It looks a bit like a smiley face, with the metaxylem forming the eyes, and the protoxylem forming the nose and smiling mouth.

@hgpennington@hgpennington· Jul 6

In 2024 I challenged myself to complete one drawing each day whilst on holiday in Japan. Kumamon, the Kumamoto bear mascot hgpenningtonart.com/...

Kumamon, the Kumamoto bear mascot, draw in in biro on white paper

@hgpennington@hgpennington· Jul 5

I painted symptoms of the burrowing nematode, Radopholus similis on banana roots. hgpenningtonart.com/...

The painting shows five longitudinal sections of banana roots, progressing from healthy to heavily infected, along with one transverse (cross) section. The increasing number and spread of necrotic lesions are represented in dark brown ink, and there are progressively fewer lateral roots as the infection advances.

@hgpennington@hgpennington· Jul 2

In 2022 I painted tar spot on sycamore, caused by the fungus Rhytisma acerinum. www.hgpenningtonart....

A picture of a simplified flat green leaf, with a black outline. There are black, tar-like spots on the surface, each surrounded by a thin outline of yellow chlorosis.

@hgpennington@hgpennington· Jul 1

I painted daisy rust, caused by Puccinia distincta, for the July illustration of the @BSPP 2024 plant pathogens calendar. bspp.org.uk/product/... hgpenningtonart.com/...

The painting shows a lawn daisy infected with Puccinia distincta. The daisy has three flower stems topped by small white flowers, and 12 leaves. There are yellow chlorotic regions on the leaves and stems, and small orange pustules. Infected leaves appear pale, stand more erect, and have rust blisters with cluster-cups (aecium/aecia) on both surfaces.

@hgpennington@hgpennington· Jun 29

In 2024 I challenged myself to complete one drawing each day whilst on holiday in Japan. toad lily hgpenningtonart.com/...

A pink toad lily (Tricyrtis sp.) in Shin-En Hana Garden, Japan

@hgpennington@hgpennington· Jun 28

I drew three crocus flowers in pen and ink, using stippling to create areas of light and shade. I then coloured the flowers and leaves with watercolour, leaving the light-reflecting areas of the petals white. hgpenningtonart.com/...

Three purple crocus flowers drawn in pen and ink with stippling, coloured with watercolour, with bright yellow and orange centres and slender green leaves against a white background.

@hgpennington@hgpennington· Jun 26

In 2023 I painted bean rust, caused by the fungus Uromyces appendiculatus. www.hgpenningtonart....

The painting shows a trifoliate runner bean (Phaseolus coccineus) leaf. The three leaflets have many yellow, roughly circular, chlorotic lesions with reddish-brown centres

@hgpennington@hgpennington· Jun 24

In 2022 I painted cacao frosty pod rot, caused by the fungus Moniliophthora rorei. www.hgpenningtonart....

A picture of a cacao plant, with six fruit pods. One juvenile pod is deformed, and three large pods have black zones of necrosis, with white fuzzy areas representing fungal sporulation.

@hgpennington@hgpennington· Jun 23

In 2025 painted symptoms of Cladosporium fulvum (synonym Passalora fulva) on a young tomato plant. This painting was commissioned for Professor Jonathan Jones’ retirement seminar and was used on the invitations hgpenningtonart.com/...

The painting depicts a young tomato plant with five leaves. Symptoms are more severe on the lower parts of the plant. The lowest infected leaves are curled and show brown, dried areas. The three bottom leaves display grayish-purple spots on the undersides and pale green spots on the upper surfaces. The top two leaves do not yet show any signs of infection.

@hgpennington@hgpennington· Jun 22

In 2024 I challenged myself to complete one drawing each day whilst on holiday in Japan. three men in a boat hgpenningtonart.com/...

A drawing of three men in a boat. I think they were fishing rubbish (trash) out of the harbour. The drawing was done in black biro on white watercolour paper.

@hgpennington@hgpennington· Jun 21

I drew a camellia flower in pen and ink, using stippling to create areas of light and shade. I then coloured the flower and leaves with watercolour, using a paler wash on the parts of the leaves that were reflecting the light hgpenningtonart.com/...

Pink camellia flower drawn in pen and ink with stippling, coloured with watercolour, surrounded by green leaves with highlighted areas showing reflected light.

@hgpennington@hgpennington· Jun 17

In 2023 I painted rice bacterial blight, caused by Xanthomonas oryzae pv. oryzae. A simple painting for a devastating disease. www.hgpenningtonart....

Ink painting/drawing of rice bacterial blight, caused by Xanthomonas oryzae pv. oryzae.

The painting shows three rice leaves with characteristic greyish white lesions with wavy margins. The lesions have spread from the leaf tip and margins.

@hgpennington@hgpennington· Jun 16

In 2022 I painted black sigatoka disease, a leaf-spot of banana caused by Mycosphaerella fijiensis. At the time of painting, this was one of my best ever paintings. www.hgpenningtonart....

A picture of a banana plant with nine leaves. Five of those leaves show leaf streaks, running parallel to the veins. The leaf streaks are yellow, with mature streaks/lesions having brown centres. In some areas, the lesions have merged leading to regions of leaf death.

@hgpennington@hgpennington· Jun 15

In 2024 I challenged myself to complete one drawing each day whilst on holiday in Japan. selfie hgpenningtonart.com/...

A drawing of a selfie photograph, with two men (left and right) and one woman (centre) all wearing disposable face masks

@hgpennington@hgpennington· Jun 14

An alligator's jawline and teeth, painted in 2021 as part of planning out a larger illustration of a dragon hgpenningtonart.com/...

The painting shows an alligator’s jawline and teeth. The alligator is painted with broad, expressive strokes, emphasising the shape rather than fine detail.

@hgpennington@hgpennington· Jun 11

In 2023 I painted pearl millet smut, caused by the fungus Moesziomyces bullatus (synonyms Sorosporium bullatum and Tolyposporidium penicillariae). www.hgpenningtonart....

The painting shows a pearl millet seed head with a single leaf. The millet seeds are small and brown. The smut-infected grains are dark brown, and larger than the uninfected seeds.

@hgpennington@hgpennington· Jun 10

In 2022 I painted club root, caused by Plasmodiophora brassicae. www.hgpenningtonart....

A picture of a young cabbage plant with five leaves. Thick, irregular club-shaped galls have formed on the roots.

@hgpennington@hgpennington· Jun 9

In 2024 I drew a slug for my light and shadow series. I gave this picture to my niece. She likes slugs. N.B. You can find my prior paintings here: hgpenningtonart.co.u...

A slug, possibly the red slug (Arion rufus), from my garden

@hgpennington@hgpennington· Jun 7

I am delighted that my illustration, of a Hippeastrum (amaryllis) grown from seed, has been displayed in the Society of Botanical Artists exhibition Plantae Online 2026 See my piece here hgpenningtonart.com/... Explore the exhibition sbaonlinegallery.oes...

I drew the flower in in Derwent Watercolour, Prismacolour and Karisma pencils, on Strathmore 400 Toned 118gsm Gray paper, so that the white edged petals would stand out. The image depicts a mostly white Hippeastrum with fine red markings.

The drawing shows two flowers, one of which is fully open. The petals are green at the centre, with red lines and speckles that increase in density toward the outer edge.

@hgpennington@hgpennington· Jun 3

In 2023 I painted ergot on barley, caused by the fungus Claviceps purpurea. www.hgpenningtonart....

The painting shows a brown barley seed head with three dark-brown ergot kernels (sclerotium), which are larger than the uninfected grains.

@hgpennington@hgpennington· Jun 2

In 2022 I painted huanglongbing aka citrus greening disease, caused by Liberibacter spp. (L. asiaticus, L. africanus or L. americanus). www.hgpenningtonart....

The painting shows a sour orange branch with three fruit and 10 leaves. The symptoms shown include leaf yellowing, fruit asymmetry, and discolouration of fruit.

@hgpennington@hgpennington· Jun 1

I painted ivy broomrape, Orobanche hederae, for the June illustration of the @BSPP 2024 plant pathogens calendar. bspp.org.uk/product/... hgpenningtonart.com/...

The painting shows a cluster of ivy leaves, from which three ivy broomrape flower stems are emerging. From left to right, the stems are at different stages of development: partially open, tall and fully open, and short with closed flower buds.

@hgpennington@hgpennington· May 31

I painted the symptoms of potato cyst nematode, Globodera rostochiensis on potato roots. Learn more: hgpenningtonart.com/... This is the fourth of twelve nematode illustrations planned for 2026.

10 round cysts in shades of tan and brown, on a white potato root

@hgpennington@hgpennington· May 28

totally fearless baby robin in my back garden