Periodične cikade - javljaju se u ogromnom broju jednom u 13 ili 17 godina (najezda)
http://insects.ummz.lsa.umich.edu/fauna/michigan_cicadas/Per...
What is a periodical cicada?
All but a few cicada species have multiple-year life cycles, most commonly 2-8 years (de Boer and Duffels 1996). In most cicada species, adults can be found every year because the population is not developmentally synchronized; these are often called "annual" cicada species. In contrast, populations of the periodical cicada species are synchronized, so that almost all of them mature into adults in the same year. The fact that periodical cicadas remain locked together in time is made even more amazing by their extremely long life-cycles of 13 or 17 years.

Periodical cicadas are found in eastern North America and belong to the genus Magicicada. There are seven species -- four with 13-year life cycles (including one new species described in 2000), and three with 17-year cycles. The three 17-year species are generally northern in distribution, while the 13-year species are generally southern and midwestern. Magicicada are so well-synchronized developmentally that they are nearly absent as adults in the 12 or 16 years between emergences. When they do emerge after their long juvenile periods, they do so in huge numbers, forming much denser aggregations than those usually achieved by cicadas. Many people know periodical cicadas by the name "17-year locusts" or "13-year locusts", but they are not true locusts, which are a type of grasshopper.

http://en.wikipedia.org/wiki/Magicicada
Magicicada is the genus of the 13- and 17-year periodical cicadas of eastern North America. Although they are sometimes called "17-year locusts" or "7-year locusts", these are misnomers as cicadas belong to the taxonomic order Homoptera, whilst locusts belong to Orthoptera.[1]

http://www.eds.org.rs/SES/2011/ZbornikSES2011_FINAL.PDF
SIMPOZIJUM ENTOMOLOGA SRBIJE 2011
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Cikade (Hemiptera: Auchenorrhyncha) predstavljaju brojnu, široko rasprostranjenu i veoma značajnu grupu insekata u prirodnim i antropogenim ekosistemima. Kao fitofagni insekti, cikade se sreću na različitim gajenim kulturama, šumskoj vegetaciji i korovskim
biljkama. Biljke oštećuju u periodu ovipozicije, tokom ishrane i lučenjem produkata metabolizma. Međutim, najveće štete koje ovi insekti nanose gajenim biljkama posledica su njihove sposobnosti da prenose biljne patogene, pre svega viruse i bakterije, uključujući spiroplazme i fitoplazme.

http://www.glasamerike.net/content/a-34-a-2004-05-13-1-1-868...
Najezda cikada
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Poznate po glasnoj pjesmi mužjaka, milijarde cikada napušta svoja legla u zemlji čim temperatura dostigne 18 stepeni Celzijusa. Neki od stanovnika Vašigntona pamte prošlu najezdu 1987 godine.

“Cikade se pojavljuju u tako velikom broju da bi bile nadmoćne nad svojim predatorima, kaže Nejt Ervin, entomolog iz muzeja Smitsonian. “
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“ Noć je i ovi insekti su proveli punih 17 godina pod zemljom. Ove noći izlaze na površinu, i penjući se uz stablo, stižu u krošnje drveća, visoke i preko 5 metara. Tu skidaju svoju opnu i pretvaraju se u cikade. Tada počinje vrlo interesantan period njihove biologije.