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but are often regularly arranged. The eggs hatch after 7-9 days into nymphs which have five instars. The first instar nymphs are green and about 2.5 mm (0.1 in) in length. Each successive instar is larger and less hairy and grey. The fifth instar is grey, with developing wing pads and about 10 mm (0.4 in) in length. The complete nymphal stage lasts about 33 days.
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lays two or three batches of about 18 eggs, but in the northern part of the range it just lays a single batch. The eggs are oval, somewhat flattened and bronze in colour, and are deposited on the underside of the leaves of the host plant. They may be clustered close together or more widely dispersed
366:
had toxic saliva, however more recent research from 1993 suggests the process of harming plants does not involve any toxins. What happens is that the insects physically damage the xylem and leaves of the plant, which causes them to wilt, darken in colour and die. The heavier the infestation, the
367:
greater the damage to the plant. Sometimes one plant or part of a plant can be heavily attacked while surrounding plants are untouched. Besides the direct damage their feeding causes to the plant, these insects can act as vectors for cucurbit yellow vine disease caused by the bacterium
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is a greyish-brown, somewhat flattened insect reaching a length of about 1.5 cm (0.6 in) and a width of 0.75 cm (0.3 in). There is often a row of alternate brown and gold spots along the margin of the abdomen. Adults survive for three or four months.
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H. B. Doughty, J. M. Wilson, P. B. Schultz, T. P. Kuhar, Squash Bug (Hemiptera: Coreidae): Biology and
Management in Cucurbitaceous Crops, Journal of Integrated Pest Management, Volume 7, Issue 1, January 2016, 1,
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to the second instar when fed on pumpkin, cucumber, or even water alone, but only pumpkin allows development to the third instar. Nymphs fed on cucumbers live longer than those who fed on water alone.
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is a true bug that feeds by sucking sap, mainly from the leaves, but sometimes also the fruit. Historically, at least as far back as 1902, some gardeners believed that
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333:; 70%, 49%, 14%, 0.3% and 0% survived to maturity on pumpkin, squash, watermelon, cucumber and cantaloupe melon respectively. Nymphs can develop from the first
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325:. Some varieties and cultivars are more susceptible to attack than others. Research has shown that
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465:"Feeding Behavior of Larvae of Anasa tristis (Heteroptera: Coreidae) on Pumpkin and Cucumber"
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521:. University of Connecticut, Cooperative Extension System. Archived from
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can grow to adulthood with varying degrees of success on different
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Squash bug eggs on the underside of yellow crookneck squash leaves
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401:"Squash Bugs Still Making Growers Crazy After All These Years"
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tachinid fly quickly depositing another egg on one of them.
269:, found throughout North America, and is a vector of the
519:"Cucurbit Yellow Vine Disease (CYVD) In Connecticut"
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In the southern part of its range, the adult female
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can be found on various members of the gourd family
463:Cook, Colwell A.; Neal, Jonathan J. (1999-04-01).
281:but shares this name with certain other species.
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277:when disturbed. It is commonly known as the
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186:Eggs on underside of squash plant's leaf
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271:cucurbit yellow vine disease bacterium
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373:. This disease can kill the plants.
202:Nymphs of several instars, on squash
506:https://doi.org/10.1093/jipm/pmv024
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399:Mertz, Leslie (20 January 2016).
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517:Boucher, T. Jude (1 May 2005).
432:Capinera, John (1 March 1999).
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223:wasp investigating them and a
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803:Taxa named by Charles De Geer
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341:
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317:, but most often occurs on
244:Mating pair of squash bugs.
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783:Hemiptera of North America
798:Insects described in 1773
793:Agricultural pest insects
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273:. These bugs can emit an
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46:Scientific classification
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40:Nymphs on a squash plant
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630:Coreoidea Species File:
469:Environmental Entomology
261:. It is a major pest of
219:Squash bugs including a
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525:on 20 December 2016
482:10.1093/ee/28.2.173
370:Serratia marcescens
16:Species of true bug
442:Featured Creatures
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745:Open Tree of Life
547:Taxon identifiers
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405:Entomology Today
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275:unpleasant odor
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147:A. tristis
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475:(2): 173–177.
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584:Anasa_tristis
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555:Anasa tristis
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315:Cucurbitaceae
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165:Anasa tristis
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156:Binomial name
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25:Anasa tristis
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527:. Retrieved
523:the original
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446:. Retrieved
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434:"Squah bug:
408:. Retrieved
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389:Arnold, 2001
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719:NatureServe
680:iNaturalist
331:host plants
306:Host plants
285:Description
113:Heteroptera
777:Categories
377:References
364:A. tristis
348:A. tristis
342:Life cycle
291:A. tristis
289:The adult
279:squash bug
109:Suborder:
83:Arthropoda
724:2.1000596
491:0046-225X
221:Sphecidae
141:Species:
103:Hemiptera
69:Kingdom:
63:Eukaryota
698:11114146
605:BugGuide
570:Q2741828
564:Wikidata
529:30 March
448:29 March
410:29 March
323:squashes
319:pumpkins
267:pumpkins
259:Coreidae
123:Coreidae
119:Family:
79:Phylum:
73:Animalia
59:Domain:
788:Coreini
760:5321518
672:2050085
633:1190231
175:), 1773
173:De Geer
129:Genus:
99:Order:
93:Insecta
89:Class:
757:uBio:
750:755700
737:236421
711:108380
685:143660
659:ANASTR
646:609233
597:373741
489:
444:. IFAS
355:Damage
335:instar
327:nymphs
263:squash
693:IRMNG
610:67889
301:Adult
134:Anasa
732:NCBI
706:ITIS
667:GBIF
654:EPPO
623:DGSK
592:BOLD
531:2016
487:ISSN
450:2016
412:2016
321:and
265:and
641:EoL
618:CoL
579:ADW
477:doi
255:bug
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420:^
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171:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
