Plant Protection Science (1998) 34, 98-104

J. Lukás and F. Kocourek (1998)
[The monitoring of apple sawfly (Hoplocampa testudinea) presence using white sticky traps]
Plant Protection Science 34 (3), 98-104
Abstract: The method of apple sawfly presence monitoring by means of white sticky traps (type Temmen, 60 cm²) was verified at two localities in Central Bohemia in 1993-1995. Apple sawly flight activity time courses and abundance differed according to the various growing seasons, and were influenced by apple varieties and pest management regimes, Sex ratios (females : males) as determined according to adult catch counts on white sticky traps also varied among particular growing seasons (from 3.5 to 0.9). The number of mature eggs in apple sawfly ovaries amounted to 15-20 eggs at the beginning of flight activity while up to 40 eggs at a later stage. The results obtained have confirmed that white sticky traps are suitable for determining apple sawfly occurrence rates and that data obtained in this way can be used for making decisions on pest control applications. Three visual traps located at a distance of approximately 25 m from each other which must be suspended in the orchard one week before the onset of the blossoming of the earliest-blossoming variety, at a clearly visible and unshaded site in the tree crown, at a height of about l.5 m above ground surface, proved sufficient for an observation point (about 1 hectare/concrete variety). With respect to the fact that apple sawfly flight activity lasts 1 to 2 weeks, trap catches are to be counted no less than three times a week. A scale has been developed which can be used for determining apple sawfly economic threshold, thus for managing apple sawfly as well while also taking into account blossom set levels, When only low apple sawfly numbers are found on the traps, control applications are not necessary, When medium captures are recorded, it is necessary to determine apple sawfly economic threshold by using a more time-consuming but also more accurate method which is based on counting blossom calyxes with deposited apple sawfly eggs and insecticides, if found necessary, are to be applied at the beginning of the larvae emergence period. It will be feasible in the near future to determine the optimum date of applications against larvae by means of a temperature model of embryonal development of apple sawfly eggs which is currently under preparation. When high captures are recorded, insecticides should be applied onto apple sawfly adults. The applications are to be implemented no later than within one day as from the date on which economic threshold has been exceeded.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Czech)
Database assignments for author(s): Jan Lukas, Frantisek Kocourek

Research topic(s) for pests/diseases/weeds:
pheromones/attractants/traps
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Hoplocampa testudinea	Apple (Malus)
	Hoplocampa testudinea	Apple (Malus)	Czech Republic