Milkweed poison is harmful to sheep, cattle and sometimes horses, especially when eaten in bulk.
The monarch caterpillar is at a high risk when they eat Milkweed. Milkweed got its name because its full of a sticky milk colored liquid. Many caterpillars get stuck in it and die. The caterpillars that eat milkweed are immune to a special toxin in the milkweed but still are at risk of dying in the sticky liquid. Butterflies do not eat milkweed. They drink nectar from flowers or juice from fruits.
Yes, milkweed sap has a strong odor that some people find unpleasant. It is known to have a milky, acrid smell that can be off-putting to some individuals.
They are a native insect that naturally feeds on milkweed plants. If by "bad" you mean are they an invasive or pest species, then no, they are not bad. Some people are allergic to their hairs though, so be careful with them...
He is not venomous.
There is common milkweed, purple milkweed, tropical milkweed, and swamp milkweed.
The white liquid milkweed secretes when cut -- and other parts of the plant -- contain a cardiac glycoside much like the one found in digitalis (foxglove). This toxin interferes with the calcium and potassium channels, and modifies the heart rhythm. Some wild food references indicate that milkweed flowers and immature pods can be safely prepared for eating. However, I'm hesitant to trust this information. So yes -- milkweed is toxic to humans.
The toxins in milkweed plants are called cardiac glycosides. These chemicals are harmful to many animals if ingested, but monarch butterflies have evolved to tolerate them and even use them for defense against predators.
Milkweed can potentially trigger allergic reactions in some individuals, particularly those who are sensitive to latex or other plant-based substances. Contact with milkweed plants or their sap can cause skin irritation, while inhaling airborne milkweed pollen may also induce respiratory symptoms in some people. It is advisable to exercise caution when handling milkweed if you have known allergies or sensitivities.
CAse
It isn't the bad food that makes you sick but what bacteria is growing in it. It can be Botulinum which makes a toxin that is the most powerful neurotoxin known to date. Only one single molecule of it is needed to stop one neuron working.1 gram of botulinum toxin would be enough to kill 14,000 people (if ingested), 1.25 million people if inhaled, or a staggering 8.3 million people if injected.
Yes. There is milkweed in Jamaica. The Jamaican Monarch lives on milkweed.
Milkweed is not a decomposer.