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Larvae feed on plants in family FABACEAE (beans, soybeans, wild legumes) — minor agricultural pest of legume crops in the southern US, though smaller economic impact than fall armyworm or corn earworm.
Female plum curculios make a diagnostic CRESCENT-SHAPED CUT on developing fruits — encircles the egg-laying site from below to isolate the egg from being compressed by the growing fruit.
Major economic pest of APPLE (5-15% of unprotected apples damaged), PEACH, plum, cherry, nectarine, apricot, pear — annual NA fruit losses total tens to hundreds of millions of dollars.
Has long curved CHEWING SNOUT with mandibles at the tip — typical Curculionidae snout-weevil feature, used for chewing through fruit skin during egg-laying.
Damaged fruits typically DROP PREMATURELY — the developing apple or peach with a curculio larva inside falls before maturing. Larvae develop inside the dropped fruit on the orchard floor.
Family Curculionidae (snout weevils) is the LARGEST SINGLE BEETLE FAMILY on Earth — over 60,000 species worldwide. Plum curculio is one of the most economically important members of the family.
Female Sirex woodwasps INJECT FUNGAL SPORES of Amylostereum areolatum into pine trees alongside her eggs — fungus digests pine wood and provides nutritional substrate for the wasp larva.
Females carry fungal spores in specialized abdominal pouches called MYCANGIA — pre-loaded fungal spore reservoirs ready for transmission to new host trees during egg-laying.
Wasp-fungus mutualism is OBLIGATE for both species — wasp cannot develop without fungus, and fungus cannot effectively colonize healthy pine trees without being injected by the wasp.
Major INVASIVE FOREST PEST across the Southern Hemisphere — Australia, New Zealand, South Africa, South America, and recently North America. Massive economic damage to pine plantations.
Combined wasp-fungus attack KILLS PINE TREES — once the wasp injects fungal spores into a healthy pine, the fungus and toxic mucus together overwhelm the tree's defenses and kill the tree over 1-3 years.
Females have SERRATED OVIPOSITOR with saw-like teeth along the edges that pierces INTACT FIRM FRUIT SKINS and lays eggs INSIDE firm, ripe, intact fruit — primary pest of marketable fruit rather than secondary pest of damaged fruit.
First detected outside East Asian native range in California in 2008 — has spread rapidly across NA, Europe (since 2008), South America (since 2013), and Africa (since 2014).
Major pest of SOFT FRUITS — cherries, strawberries, raspberries, blackberries, blueberries, grapes. Annual NA economic losses estimated in HUNDREDS OF MILLIONS OF DOLLARS.
Unlike the related vinegar fly Drosophila melanogaster (which feeds on overripe and rotting fruit), spotted-wing drosophila attacks FIRM, RIPE, INTACT FRUIT — primary pest behavior, not secondary pest behavior.
Focus of major USDA control programs since 2008 — bait sprays, cultural management, pheromone trapping, Sterile Insect Technique, and (most recently) GENE-DRIVE research for population suppression.
The yellow crazy ant is on the IUCN list of WORLD'S 100 WORST INVASIVE SPECIES — recognized as one of the most ecologically destructive invasive species globally.
Killed an estimated 10-15 MILLION RED LAND CRABS on Christmas Island (Indian Ocean) — the KEYSTONE SPECIES of Christmas Island ecosystems. Sprays formic acid that blinds and kills the crabs.
Forms MASSIVE SUPERCOLONIES — covered up to 30% of Christmas Island land area with continuous yellow crazy ant populations of unprecedented density in the late 1990s.
Workers move in rapid ERRATIC ZIG-ZAG patterns — very different from the methodical foot-trailing behavior of most ant species. Source of the 'crazy' common name.
Sprays FORMIC ACID as primary attack — temporarily blinds and ultimately kills target prey by acid penetration into eyes and soft tissue. Same chemical as European red wood ants but used aggressively.
Constructs UNIQUE TWO-PART WEB — a concave BOWL of densely woven silk above a flat DOILY sheet, connected by vertical threads. The spider hangs upside-down at the center of the bowl.
Knock-down threads above the bowl extend up to nearby vegetation — flying insects strike the threads, lose flight stability, and fall down into the bowl where the spider seizes them.
The doily structure below the bowl provides PROTECTION from the spider's own predators (parasitoid wasps, larger spiders) attacking from below — must penetrate the doily before reaching the spider.
Family Linyphiidae (SHEET-WEB WEAVERS) is distinct from the more familiar orb-web weavers in Araneidae — sheet webs are flat or domed, not the radial-spoke pattern of orb webs.
Females are only 3-4 mm body length — much smaller than the more familiar orb-weaving spiders, but construct one of the most elaborate web architectures in NA spider biology.
The catalpa worm is one of the MOST-PRIZED FRESHWATER FISHING BAITS in the southeastern US — catfish and bass cannot resist the worm. Particularly valued for big catfish.
Fishermen have PLANTED CATALPA TREES specifically as 'CATALPA WORM FARMS' for over a century — old plantings 50-100+ years old are still maintained by multi-generational fishing families across the southeastern US.
Larvae are color polymorphic — bright GREEN or BLACK forms occur in the same broods, both with bold yellow lateral stripes and a prominent black dorsal horn on the eighth abdominal segment.
Larvae can completely defoliate catalpa trees in outbreak years — regular outbreaks every 3-5 years across the southeastern US. Defoliation is conspicuous but rarely fatal to host trees.
