The plant pathogen genus Phytophthora, a water mold with similarities to a fungus, is a worldwide threat to ornamental and commercially valuable plants due to how it can develop undetected in the early stages of an infestation. While there are some species of Phytophthora that begin an infestation on the above ground portion of a plant, a much larger portion of the approximately 170 known species of the pathogen start out destroying a plant from within its roots. Phytophthora moves upward from the roots through the water channels of the plant, interfering with the plant’s ability to absorb water as it goes. The effect makes the plant appear drought-stricken, which is essentially the case.
One of the plants heavily afflicted by Phytophthora in the past 30 plus years has been the cocoa tree, Theobroma cacao, and specifically the cocoa trees planted in western Africa, where most of the world’s cocoa beans are produced. The species of Phytophthora doing the most damage in that period has been Phytophthora megakarya, a disease that blackens the pods which contain the cocoa beans, rendering most of them unfit for consumption. This disease and a virus transmitted by mealybugs called cacao swollen shoot virus (CSSV) in combination have decimated cocoa tree plantations in western Africa in recent decades.
A Venn diagram showing the combination necessary for disease to form. This can apply to humans and animals as well as to plants. Illustration by Earlycj5.
Phytophthora megakarya was introduced from the Americas, where it had long co-existed with the native cocoa trees. The cultivated cocoa trees of western Africa had developed for generations without having to cope with infestations from megakarya, though they had long been contending with Phytophthora palmivora, a less devastating disease for them.
CSSV was native to the forest trees of western Africa, where it did little damage because of long term co-evolution of the trees with the virus. The introduced cocoa trees had no inherited defense against CSSV, resulting in afflicted cocoa trees losing vigor and dying within a few years. Meanwhile, the ants that farmed the mealybugs for their sugary secretions have ensured they continue to live safe from predators by guarding them, even building shelters for them.
Chocolate has grown steadily more expensive, at a rate beyond ordinary inflation, due primarily to shortages of cocoa beans caused by these pathogens. Another reason for chocolate price increases has been related to the salutary shift away from indentured labor on cocoa plantations, making the price more accurately reflect the true cost of production. The cost of production is bound to catch up with any resource as nature asserts itself in one way or another, or in many ways, and imagining that we are immune or insulated from the effects of that assertion is mere hubris and folly. Ultimately, we will pay the price.
— Izzy
Figs are ripening now all across the southern United States, and by September the figs in the northern half of the country will ripen. If a gardener has 20 to 30 square feet to spare outside, preferably in a sunny spot protected from cold winter winds, then planting a fig tree would be a productive use of that space. For the gardener who doesn’t have enough outdoor space, then planting a dwarf fig tree in a pot and setting it by a sunny window is a great way to get plenty of fruits (technically a fig is not a fruit, but a fleshy stem with multiple ingrown flowers), and without a great deal of fuss over pests, diseases, and special requirements.
A squirrel nibbling a fig in the Bodhi Tree at the Mahabodhi Temple in Bodh Gaya, Bihar state, India. Photo by Flickr user Anandajoti.
A self-pollinating dwarf fig variety does not require a tiny wasp to pollinate it, unlike varieties such as Smyrna figs. Contrary to common belief, most figs commercially available these days, either as fresh or dried fruits in grocery stores, or as plants for sale to home gardeners, are self-pollinating varieties and therefore it is unlikely consumers will eat a tiny, imprisoned wasp in a fig. Even if they did, there’s no harm in it, and anyway the enzymes produced by the ripening fig will have dissolved the wasp by the time the fig is ready for consumption. That delicate crunchiness inside any ripe fig generally comes from the seeds, and rarely from an insect exoskeleton.
In growing figs outdoors, southern gardeners have a big advantage over northern gardeners because they have to do relatively little to protect their trees from winter cold. Wrapping the branches in burlap and perhaps adding a layer of mulch around the roots are all that is required in the South. There will be some branch die back even so in an average winter, but usually nothing like the major losses incurred by fig trees in the North unless gardeners lay the trees down in trenches and pile mulch and wind protection on top of them.
For a 2017 album, Blakey Morton performed Scott Joplin’s 1908 song “Fig Leaf Rag”.
Once a fig tree has established a vigorous root system over the course of five to ten years it can withstand die back of the entire above ground portion and still bounce back in the spring with enough new growth to produce fruit later in the summer. But the difficulty in the North is that without sufficient winter protection the roots themselves may die, and of course that is the end of the tree. Italian immigrants to the northeastern part of the country deemed the extra work worthwhile for the sweet figs they could pluck off their own trees at the end of summer, and they introduced the practice of laying the trees down in winter when they first started arriving in this country in the late nineteenth century. The people of this country, almost all descendants of immigrants themselves, can surely appreciate the sweet taste of the fig along with its rich lore and its association with other immigrants and their generous sharing of knowledge; and since a fig is much more in cultures around the world than a simple fruit, perhaps the people of this country of immigrants can even find enlightenment under the fig tree, wherever it grows.
— Izzy
For decades now, when gardeners needed a windbreak or a privacy screen they have resorted to planting hedgerow monocultures of a few relatively fast growing evergreen species, among them the Leyland cypress. For some who prefer a more formal, planned look, that plan has sufficed, but others might look at such a hedgerow as boring and as a lost opportunity to bring more wildlife into their gardens. Planting with wildlife in mind takes a generous spirit, particularly for the gardener who is also trying to raise fruits and vegetables for their own consumption. There are trade offs and compromises involved.
One of the problems with a hedgerow monoculture occurs when one or more of the plants dies, creating a gap that must then be filled with the same kind of plant, sometimes at considerable expense if the new plant is not to be too conspicuous by its smaller size. The gardener can feel trapped, and the trap can get more enveloping and add even more expense if the reason for a plant’s death is a disease or pest, engaging the gardener in an endless battle. Sometimes it can be a blessing when a disease or pest spreads quickly from one plant in the monoculture to the next, ending the battle with its consequent frustrations and expenses and presenting the gardener with a blank slate after a tree removal company has carted away the battlefield fallen.
This colonnade of Leyland cypresses in England is presumably a windbreak for the greenhouses behind. Photo by Ben Gamble.
Instead of persisting in folly and boring landscaping, a gardener might decide it is wiser and more interesting to plant rows or clumps of a diverse assortment of trees and shrubs, more closely imitating nature. The gardener might look for evergreen trees for year round screening for the gardener and cover for wildlife; deciduous trees which with their tall, rounded crowns fill visual gaps between the conical forms of the evergreens, and add nuts and acorns for wildlife food; shrubs and small trees both evergreen and deciduous which give fruits and berries in different seasons; and finally a water source, preferably running rather than stagnant. That’s a privacy screen for the gardener and a home for wildlife, and it isn’t only for large properties, since there are almost always dwarf or semi-dwarf forms of trees available.
Inviting wildlife into the garden this way means being willing to compromise on the amount of produce left for the gardener, and also means protecting vulnerable young plants from the very same wildlife. This is a microcosm and an imitation of nature, after all, and not truly nature. In nature the loss of a few sapling trees here and there to deer browsing is not necessarily a catastrophe since there may be as many more that will survive to maturity. But for the gardener who may have space to plant only a few trees, the loss of even one young tree is important. An example would be the gardener who joins in the effort to restore the American chestnut to the landscape and helps the cause by buying and planting a few saplings at home. Unless that gardener cages the chestnut saplings for the first two or three years of their growth, deer will come along and browse the foliage and rub velvet off their antlers using the trunks of the saplings, debarking them. Caging is the only truly effective way to get deer to leave the chestnut saplings alone until they are big and strong enough to withstand their attentions.
On a small lot in particular a gardener should not expect to get very many fruits and berries for their own consumption. Birds love eating the same things, and they are outside all day every day, watching for ripeness, and when it comes the birds get to the fruits and berries very soon. Netting is a nasty business that tangles up birds and other critters, killing them, and it has no place in a garden planted for wildlife. Either be content with gleaning a few fruits and berries here and there, or build a small greenhouse to grow a few protected plants. Gardeners with large plots of land have more options, both for the wildlife and for themselves. Plant native plants when possible, because they are better adapted to coexist with native wildlife. Once there are birds and frogs and other insect eaters living nearby, the gardener may actually find fewer pest and disease problems in the rest of the garden, and that alone makes it worth the trouble of devising a landscape scheme more varied and interesting than a soldier row of Leyland cypresses.
— Izzy
