UC IPM: UC Management Guidelines for Planthopper on Bermudagrass Seed Production

UC Pest Management Guidelines

Bermudagrass Seed Production

Planthopper

Scientific Name: Toya propinqua

(Reviewed 1/07, updated 1/07)

In this Guideline:

Description of the pest
Damage
Management

DESCRIPTION OF THE PEST

The planthopper (often incorrectly referred to as a "fulgorid" but actually a member of the planthopper family Derbidae) may be abundant on bermudagrass florets and leaves from mid-spring through fall. Toya propinqua is a small, tan planthopper, about 0.13 inch long. Adult planthoppers can be observed hopping and flying when disturbed. The nymphs resemble adults but are wingless. Adults and nymphs may be found in bermudagrass at any time during spring and fall seed-production seasons.

DAMAGE

Planthoppers are of greatest concern during spring and fall seed-production seasons when plants are in bloom. Their feeding reduces plant vigor, but the greatest concern is contamination of seed heads with honeydew deposits that make the seed difficult to harvest and clean.

MANAGEMENT

Monitor seed fields with a sweep net for planthoppers when florets are developing and continue through seed harvest. No threshold is established; however, in a commercial field study, a level of 12 leafhoppers per 90° sweep was not high enough to cause seed harvest problems.

Common name

Amount/Acre

R.E.I.+

P.H.I.+

(trade name)

(hours)

(days)

When choosing a pesticide, consider information relating to the impact on natural enemies and honey bees

ACEPHATE

(Orthene) 75S

1.33 lb

MODE OF ACTION: An organophosphate (Group 1B)¹ insecticide.

COMMENTS: Available for use under a 24(c) registration. Do not feed crop residue to livestock or allow animals to graze treated areas. Do not apply this product through any type of irrigation system.

Restricted entry interval (R.E.I.) is the number of hours from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (P.H.I.) is the number of days from treatment to harvest. In some cases the REI exceeds the PHI. The longer of the two intervals is the minimum time that must elapse before harvest.

Modes of action are important in preventing the development of resistance to pesticides. Rotate chemicals with a different mode-of-action group number, and do not use products with the same mode-of-action group number more than twice per season. For example, the organophosphates have a group number of 1B; chemicals with a 1B group number should be alternated with chemicals that have a group number other than 1B. Mode of action is assigned by IRAC (Insecticide Resistance Action Committee). For additional information, see their Web site at http://www.irac-online.org/.

UC IPM Pest Management Guidelines: Bermudagrass Seed Production
UC ANR Publication 3472
Insects and Mites
E. T. Natwick, UC Cooperative Extension, Imperial Co.
M. D. Rethwisch, UC Cooperative Extension, Riverside Co.

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