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Sarah Arnold

@sejarnold.sciencemastodon.com.ap.brid.gy
4 followers 0 following 43 posts

Entomologist, interested in sustainable agriculture, pollination, applied ecology, insect behaviour and natural history in general. Working at Niab […] [bridged from sciencemastodon.com/@sejarnold on the fediverse by fed.brid.gy ]

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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 13/03/2025
1. Agroforestry - including dynamic agroforestry. Some countries (e.g. parts of Brazil) have long traditions of shade-grown cocoa under either natural forest canopy or alongside native or economically-useful shade trees (fruit, medicines, timber, firewood, etc.).
Cocoa solutions: (Dynamic) Agroforestry
Cocoa trees alongside: - fruit trees (e.g. mango, papaya), - banana or plantain, - shading timber trees
Provides different forestry products
More complex environment = fewer pests and diseases, more resistance to drought, flooding, heatwaves
Image shows a stylised cluster of cocoa trees interspersed with other non-cocoa trees, including banana, shaded by a large tree that projects above the main canopy
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 10/03/2025
6. Deforestation If cocoa farms become less productive and are not supporting the cocoa farmers' livelihoods, there is a risk that farms will expand - possibly into natural forest areas. New EU directives seek to reduce this, but implementing them can be […] [Original post on sciencemastodon.com]
Cocoa challenges: Deforestation
Many cocoa dfarms have low/declining yields - same land, less income
Sketch of cocoa farm adjacent to forest
Cocoa farm expands into forest
Sketch of the same cocoa farm and forest, but chunks taken out of the forest and converted to farm
Areas of forest gradually lost
Solution bubble: Sustainable improvement of yield from the same land area means less need to expand. Better data collection allows us to map farms' boundary changes
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 10/03/2025
5. Pollination It's common for fewer than 5% of flowers on a cocoa tree to be pollinated under normal conditions. We still have big gaps in our understanding of cocoa pollinators & their needs. They may be threatened by drought, overuse of pesticides, & loss of breeding habitats.
Cocoa challenges: Pollination
Image showing cocoa flower cluster
Many cocoa varieties need pollination or they will not produce pods
Option 1: Natural pollination. Midges, other insects.
Threats: Climate change, pesticide use, farm management
Images show two small insects highly magnified, a midge and a parasitoid wasp.
Option 2: Hand (manual) pollination
Image of a human carrying out hand pollination of cocoa with forceps.
Drawback: costly, difficult, time-consuming.
Pollination is a problem for all cocoa-growing regions.

Solution bubble: Better understanding of the most important/effective pollinators, creation of habitat, reduce toxins in environment
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 10/03/2025
4. Drought Among all the cocoa experts we talked to in Brazil & West Africa, climate change was mentioned often, & especially how it affects rainfall patterns. This can mean: dry seasons are longer/more intense, wet seasons come early, late or erratically, & continue for longer, or end too soon.
Cocoa challenges: Drought
Late rains can delay or prevent the cocoa trees flowering, and also there may be fewer pollinators.
A cycle shows rains arriving, cocoa flowering, pods developing, then during the dry season, harvest occurs. Annotations explain that yields will be lower in drought years, and in extreme drought, trees can drop leaves and forest fires become more likely.
The solutions bubble explains that better harnessing of nature, via agroforestry and soil protection, can help. Affordable and sustainable irrigation, and breeding drought-tolerant varieties also helps.
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 10/03/2025
3. Black pod. Black pod disease is caused by an oomycete (a bit like a fungus). In severe cases, whole crops & trees are lost. Infected pods turn black & can't be used. Risk factors include rotting plant material (e.g. old pods) harbouring spores, and high humidity on farms.
Infographic
Cocoa challenges: Black pod
Infographic showing cocoa pods that are over half dark-brown/black with disease, explaining "Caused by Phytophthera (an oomycete, a fungus-like infection". Can cause total crop loss. Old pods on farms can be a source of spores. A photo of rotting cocoa pods asks "But is there a tradeoff? Old pods are important for pollinators!" 
Solutions bubble: Research – better understanding of how the disease moves on farms
Safe/biological pesticides
Managing humidity on farms – can be harder with climate change
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 10/03/2025
2. CSSVD Cacao swollen shoot virus disease: a major problem in West Africa. Transmitted by mealybugs (small insects, feeding on tree sap), which are moved around by ants. Ants protect mealybugs in exchange for drinking the honeydew they secrete. This means ants fight off predators of mealybugs!
Cocoa challenges: CSSVD
Infographic shows white fluffy mealybugs on woody plant material, with virus icons coming out and into a tree image. Icons indicate felling as the only real control option, with associated income loss to farmers. Solution bubble says: New methods to control mealybug – biological methods, trap crops?
Early detection = fewer trees need felling
Breeding virus-resistant trees
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 10/03/2025
1. Illegal mining (galamsey). HUGE issue in Ghana. Either a mining business turns up and offers to buy a farmer's land...or worse, just moves in nearby and starts digging. For a farmer having a bad year, the prospect of selling up for quick cash can be tempting...but what about next year?
An infographic showing the exchange of money for cocoa farmland by symbols representing gold-mining, resulting in tree loss. A collection of symbols indicates that this has bad impacts in terms of contamination of land and water. Another collection of symbols and brief text explain this trades of short-term cash for long-term income. A bubble "solutions" explains: Sustainable cocoa yields and good prices means more motivation to keep farming
Community coordination means communities can resist galamsey better than individuals.
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 03/01/2025
Are you interested in research/innovation to solve challenges in sustainable cocoa in Brazil, Ghana or Nigeria? We are holding two free online workshops to prepare for future funding calls around climate-smart multilateral cocoa collaborations. 15th […] [Original post on sciencemastodon.com]
A cocoa tree trunk with about 4 large pods on it that are attractively green with dark red highlights on them. Cocoa pods are rugby-ball shaped and come straight out of the trunk.
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 30/12/2024
We got wonderful sunshine for the Kent Field Club #NewYearPlantHunt at Milton Creek Country Park and surrounds. Some cheery little flowers, a queen bumblebee (not photographed), a few dung flies using Apiaceae, some birds enjoying the estuary, some fun […] [Original post on sciencemastodon.com]
Yarrow - some delicate white flowers in clusters, with small floofy ferny leaves below. Background is grass and a kerbstone.Narrow-leaved ragwort - cheerful yellow sunshine-like flowers about 1.5cm across, at the end of stems. The leaves are fairly dark green and narrow and spindly. The plant sits on a slope of mixed plants leading down to a paved area.A pleasingly round and unblemished mushroom, probably 7cm across in real life. Colour is a creamy-beige-pale-brown. The edge is quite "crisp", with just a little bit of a turnup so you can see the hint of the gills below. Background is dead fallen leaves and green grass.
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 10/12/2024
Nearly ready to start... At Choco-Tec. Looking forward to 3 days of learning about latest advances and perspectives in the #cocoa industry.
A crowded conference room with logos of many cocoa industry organisations on the wall.
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 03/12/2024
Do you work in any area of cocoa? We are seeking opinions on research priorities and challenges in the cocoa sector, especially production and processing. Please complete our form (5-10 min) to share your opinions/priorities […] [Original post on sciencemastodon.com]
A young cocoa pod hanging from a horizontal branch. A multi-coloured bug nymph is walking on it, facing down. The pod is green, and has a squiggly brown line of some sort of miner/borer pest across its surface. Next to the pod is a single cocoa flower, creamy white and about 1cm across.
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 10/11/2024
Some offerings for #WildflowerHour : a hemlock Conium maculatum in the middle of a field being frothy and cheerful, and a Solanum nigrum covered in little white "stars" - they seem to have come up all along the edges of some of the local arable fields this autumn.
Amongst various small green plants, a Solanum nigrum which has white, five-pointed star shaped flowers with yellow centres, a bit like tomato flowers but white. The flowers are fairly abundant for the size of plant and time of year.A plant with lots of branches coming out its central stem (which is green but mottled with brownish-purple markings). Each branch terminates in a clustered white frothy flower made of lots of tiny tiny flowers. The leaves are further below and are quite delicate/lacey. The view is more or less from above the plant.
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 06/11/2024
Grateful to be mostly offline this morning, attending the #NationalFruitShow, a useful trade fair for UK fruit growers, industry, producer organisations, researchers, etc. The fruit show element itself is a good chance to see the "best of" different […] [Original post on sciencemastodon.com]
A table containing clusters of extremely large pears, and rather large apples. The clusters contain 5 fruits each, of different varieties and colours from green through to red, but all are unusually large. Each cluster has a label naming the grower who produced it and total weight.A long sloping display of boxes of apples, elegantly arranged so the fruit in each box all face the same way. The foreground has matte-yellow-brown apples of Russet varieties. Rich, shiny red apples are visible further along the display (Cox, Braeburn, etc. varieties). Some boxes have colourful rosettes indicating winners.
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Sarah Arnold @sejarnold.sciencemastodon.com.ap.brid.gy · 27/10/2024
Musk stork's bill Erodium moschatum for #WildFlowerHour, as it was still managing a few hopeful flowers before the contractors mowed them off again. It's become ubiquitous on grass verges in the village and I rather like it.
A plant growing at the kerbside in a grass verge, with slightly ferny, pinnate leaves and a pair of ~2cm across pink flowers with rather narrow, slightly tatty looking petals.
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