Beware of the Higad! (Tussock Moth Caterpillar)
Dr Abe V Rotor
Living with Nature - School on Blog
Adult of the tussock caterpillar is a gray moth with markings that serve as camouflage. It undergoes four stages. The pupal stage is short, about a week. The caterpillar undergoes four or five moltings.
First aid: Train melted candle over embedded bristles, then carefully peel off. Apply vinegar on the affected area to dissolve remaining bristles. Do not rub.
Higad - caterpillar of Tussock Moth (Budo-budo Ilk).Tussock moth caterpillars in three stages (instars), pupa (left, scantily covered with cocoon thread), molted skin (lower left), and frass or waste. Snowy tussock moth mimic the color and pattern of its host tree, and growing lichens.
This species of Tussock Moth caterpillar belongs to Family Lymantiidae, Order Lepidoptera. It is a commonly found on Fire Tree (Delonix regia) which blooms in summer. The colorful caterpillar, about an inch long in its last instar, dangles from the tree with spinneret and sways in the slightest breeze. It often lands on a passerby and causes extreme discomfort that needs immediate medical attention. The rule is to remove the caterpillar immediately without rubbing the affected area. One who is particularly sensitive to higad must get immediate help.
Tussock moth - a master of camouflage. It can adjust
to the color and pattern of its environment.
We call it samrid in
Ilocano, higad in Tagalog and Pilipino. It is perhaps the most
avoided insect next to the putakti or paper wasp. Unlike the
latter, the injury one gets by contact with this spiny caterpillars is far
reaching - it can spread to other parts of the body. Thus the rule is: Never
rub - not even touch, the affected area. If feasible, light a candle, train the
drops on the embedded spines, allow to solidify, then lift off. In this way the
spines are pulled out without much damage. Apply vinegar to neutralize the
alkaline chemical substance. Taking a bath without vinegar treatment will only
spread the minute Neptune spear. There are people who are extremely allergic to
higad that they need immediate medical treatment with antihistamine drug.
Tussock moth caterpillars are passive
and tend to group together. Before they enter pupal stage they descend from
their host tree, hide in crevices, and other suitable places where they will
later emerge as moths.
Skin castings of higad can inflict
considerable injury. Eliminate castings by burning or burying, just as
caterpillars are disposed off. Higad may inflict the same injury on pets.
Regular smudging (smoke emitted by burning dead leaves) can effectively reduced
higad population. Household insecticide spray can help. Community control using
chemicals needs expert's assistance. ~
Leo Carlo is the most sensitive in the family to allergy. At one time I rushed
him to the nearest hospital for immediate shot of antihistamine. He stepped on
the casting of higad, the caterpillar of the tussock moth. In his
attempt to soap away the embedded bristles, he unknowingly caused it to spread
all over his body. He stayed in the hospital until the swelling subsided.
Some years earlier Leo had a similar experience. The allergy came from the eggs
of talakitok fish he ate. The swelling was so severe his eyes were
virtually closed. Timely anti-allergy injection saved him.
Allergy runs in the family. Marlo, my oldest son is allergic to all kinds of
crustaceans, from crabs to shrimps. I am allergic to tulingan fish.
But it is insect allergy that we are always on the guard. Insects are perhaps
the most common causes of allergy in the world. Let me cite some findings and
experiences.
• The popular image of insect allergies is its association with the bites and
stings of venomous species like bees, ants, and wasps (injectant allergens).
Over one-hundred deaths per year in the U.S. are attributed to fatal
reactions to arthropod venoms. We don’t have any record in the Philippines on
casualties from this cause.
• More common allergic reactions attributable to insects include those caused
by contacting body parts or waste products (contactant allergens) or inhaling
microscopic dust particles composed of pulverized carcasses, cast skins and
excreta (inhalant allergens). Symptoms range from eczema and dermatitis, to
rhinitis, congestion and bronchial asthma.
• Mites which are relatives of insects that infest cheese, bran, dried fruits,
jams and sugars are known to cause transient dermatitis among workers when body
fluids are re leased upon crushing. Similarly dust mites that inhabit our
dwellings cause cold symptoms often diagnosed as such, or as asthma.
. There are people sensitive to mosquito bite. Usually it is accompanied by
swelling of the affected area and itchiness, becoming dark afterward. It takes
a week or more for the skin to return to its normal color. This symptom may be
similarly manifested by the bite of flea (Siphonoptera).
• Nine orders of insects, and mites and spiders (Arachnids) were found to be
the sources of the inhalant allergens. In the US a survey found out that allergy
symptoms are due to direct or airborne exposure to Lepidopteran (moth and
butterfly) scales - despite the use of exhaust hoods and protective masks and
clothing. Case histories of asthma among Lepidoptera workers are numerous.
• Personally I discourage the use of butterflies released in wedding
receptions, and other occasions for that matter. Scales of the butterfly (and
moth and skippers as well) are made up of a very tough kind of protein known as
chitin which can cause blindness other than allergy. Children are most
vulnerable to this.
• Reactions to Orthoptera (grasshoppers, crickets, locusts, cock roaches, etc.)
are also common in the form of rhinitis, itching skin, bronchitis and
ultimately asthma in general sequence. A researcher suffered dyspnea (labored
breathing) during a prolonged session of grinding crickets into meal to
supplement chicken feed. There are also cases of anaphylactic shock involving
orthopterans.
. Have you experienced waking up with swollen eyelid? One explanation is that,
you must have been bitten by cockroach (Periplaneta or Blatta)
while you were sleeping. Cockroaches eat on almost anything, including dried
tears.
• Workers in grain warehouses exposed to the insect pest like weevils
(Coleoptera) suffer from skin itching, hives, rhinitis, dyspnea, and bronchial
asthma.
• Flies and midges (Diptera) as well as mayflies (Ephemeroptera) and caddis
flies (Trichoptera) have likewise been implicated as allergy.
• Fortunately processing – from milling to cooking - largely diminish the
potential threat of food allergies as compared with their reactivity in raw
form. But this is no guarantee of eliminating the allergen. One may be allergic
to the bean weevil that attacks mungbean, and when the bean is cooked the
insect allergen is diminished. But the allergy to the bean itself is not. One
school of thought suggests that insect allergens in food are deactivated by
cooking, or deactivated in the highly acidic environment of the stomach.
. Red ants bite and sting, injecting formic acid in the process, which explains
the extreme pain sensation. Because they attack by group, the amount of formic
acid may reach a level that leads to anaphylaxis to sensitive people, and may
cause death. Children are most vulnerable.
. The most dangerous sting comes from the wild African honeybee that hybridized
with the domesticated honeybee since its entry to the US several
years ago. Beekeepers have learn to deal with the crossbred because it produces
more honey than the domesticated type. Except for hornets, they are perhaps the
most dangerous bees in the world.
. We have a local counterpart of hornets - the paper wasp or putakti.
They are however less dangerous because they attack only intruders or when they
are disturbed.
. The tree ant, locally known as hantik, can cause extreme pain and
discomfort to orchard growers and fruit pickers, intruders notwithstanding.
There are people who are highly allergic to their poison.
. Relatives of insects that are harmful for their poison are
- Black Widow spider (Most
dangerous arachnid)
- Scorpion
- Centipede
- Millipede (it exudes cyano
gas when threatened)
• There is evidence for cross-reactivity among distantly
related members of the Arthropoda suggesting the existence of common allergens
within the phylum. So, if you are allergic to shellfish, you are likely to be
allergic to say, camaro (fried mole cricket) a delicacy not only locally
but in other parts of the world.
Beware of insects, especially those that cause allergy.
Higad!
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*Lesson on former Paaralang Bayan sa Himpapawid (People's School-on-Air) with Ms Melly C Tenorio 738 DZRB AM Band, 8 to 9 evening class, Monday to Friday [www.pbs.gov.ph]