Thrips simplex

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Thrips simplex
Scientific classification
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T. simplex
Binomial name
Thrips simplex
Morison, 1930

Thrips simplex is a species of insect in the genus Thrips in the order Thysanoptera. It is commonly known as the gladiolus thrips and infests gladiolus plants as well as various other monocotyledonous plants such as lilies, irises and freesias.

Contents

Description

Thrips simplex is a tiny insect, measuring 2 mm (0.08 in) long, with a long slender brownish-black body with a pale band at the base of the wings. The larvae are wingless and yellow or orange. These thrips live hidden inside the leaf and flower sheaths of their host plants where they suck sap, usually occurring in groups. [1] [2] Females may lay about one hundred eggs over the course of a few months and there may be two or three generations each year. The eggs are laid on or in the plant tissues and the larvae suck sap. After two larval stages they develop into non-feeding prepupae and may drop off onto the soil. After a brief pupal stage they become winged adults. [1]

Damage

The gladiolus thrips feeds on gladiolus, lily, freesia, crocus and iris, but damage is mostly limited to the gladiolus. [3] The thrips can remain inside the corms of gladiolus over winter, causing them to ooze sap from the wounds, turn brown and sticky. These corms are the main source of infestation in growing plants the following year; the emerging leaves are tunnelled and appear silvery at first, turning brown later. Heavy infestation can cause poor plant growth and the plant may fail to flower. When the thrips tunnel into the flowers, these can be scarred and distorted. [3] Other damage may be brown buds, discoloured or streaked blooms, and bleached or distorted flower spikes. [3]

Control

The gladiolus thrips cannot survive in the soil in winter in areas where there are frosts and will also be killed if gladiolus corms are lifted and stored between 35 and 40 °F (2 and 4 °C) for four months. [2]

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Heliothrips haemorrhoidalis is a species of thrips in the family Thripidae. It is most commonly known as the greenhouse thrips, the glasshouse thrip or black tea thrips. This species of thrips was first described in 1833 by Bouché in Berlin, Germany. H. haemorrhoidalis also has many synonyms depending on where they were described from such as: H. adonidum Haliday, H. semiaureus Girault, H. abdominalis Reuter, H. angustior Priesner, H. ceylonicus Schultz, Dinurothrips rufiventris Girault. In New Zealand, H. haemorrhoidalis is one of the four species belonging to the subfamily Panchaetothripinae.

<i>Selenothrips rubrocinctus</i> Species of thrip

Selenothrips rubrocinctus, commonly known as the redbanded thrips, is a species of thrips in the family Thripidae. It was first described from the West Indies but may have originated in northern South America. It has spread to other parts of the world and now has a near pan-tropical distribution, occurring in North, Central, and South America, Africa, southern Asia, and Australasia.

References

  1. 1 2 "Gladiolus thrips". Royal Horticultural Society. Retrieved 23 February 2017.
  2. 1 2 Dreistadt, Steve H. (2001). Integrated Pest Management for Floriculture and Nurseries. UCANR Publications. p. 328. ISBN   978-1-879906-46-4.
  3. 1 2 3 Cranshaw, Whitney (2015). Garden Insects of North America: The Ultimate Guide to Backyard Bugs. Princeton University Press. p. 388. ISBN   978-1-4008-6678-6.