Biobest.be

Cultivos

Rose

Pests in rose

General

Aphid

Spider mite

Thrips

Whitefly

General remarks on the biological control in roses

	Before using the advised selective chemicals, check if they are registered for this crop in your country.
	Before introducing beneficials, the greenhouse and plants should be free of harmful pesticide residues.
	Yellow and/or blue sticky cards can be used preventively for the detection of flying insects.
	Dusting pesticides affects the parasitic wasp Encarsia formosa and beneficials adversely.
	In case of doubt about the side effects of any pesticide, consult the Biobest list of "Side Effects of Pesticides on Beneficial Organisms", or contact Biobest or its dealer.
	Using humidifiers will create a better climate for the development of the beneficials.
	Using insect-proof nets in the ventilation openings will prevent insects like thrips, aphids, and whiteflies from flying into the greenhouse and thus decreases the infestation.

Biological control of thrips

	(western flower - Frankliniella occidentalis)
	(onion thrips - Thrips tabaci)

Amblyseius-Breeding-System (A.B.S.) (predatory mite Amblyseius cucumeris in breeder bags)

	Hang up yellow and/or blue sticky cards for detection of thrips (at least 1 sticky plate/500 m²).
	Introduce 5.000 breeder bags/ha (200 Amblyseius/breeder bag) (1 million of Amblyseius cucumeris/ha in total.

Amblyseius-System (predatory mite - Amblyseius cucumeris)

Sprinkle 100 Amblyseius cucumeris/m² per week or every 2 weeks in "hot spots".

Hypoaspis-System (predatory mite - Hypoaspis miles)

	Introduce in spring 50 Hypoaspis miles/m² to control thrips pupae (in case of soil culture).
	Remark: Do not leave open flowers in the greenhouse, as thrips larvae can develop very quickly in them.

Biological control of aphids

	(cotton aphid - Aphis gossypii)
	(green peach aphid - Myzus persicae)
	(potato aphid - Macrosiphum euphorbiae)
	(glasshouse potato aphid - Aulacorthum solani)

Aphidius-System (parasitic wasp - Aphidius colemani)

	For control of cotton aphid (Aphis gossypii) and green peach aphid (Myzus persicae).
	Introduce preventeively 0,15 Aphidius colemani/m² per week.
	After detection of the first aphids: introduce at least 0,5-1 Aphidius colemani/m² for at least 3 weeks.
	Sprinkle Aphidius colemani in the supplied hangers (ca. 25 hangers/ha).

Aphidoletes-System (gall midge - Aphidoletes aphidimyza)

	Introduce 5-10 Aphidoletes/m² per week in and around "hot spots" for at least 3 weeks.
	Spread Aphidoletes aphidimyza on a moist substratum.
	Attention! Sulphur has a negative effect on Aphidoletes aphidimyza .

Ervi-System / Aphelinus-System (parasitic wasps Aphidius ervi and Aphelinus abdominalis)

	Introduce Aphidius ervi/Aphelinus abdominalis when Macrosiphum euphorbiae (potato aphid) or Macrosiphum rosae (rose aphid) are spotted.
	Introduce 2 Aphidius ervi/Aphelinus abdominalis /m² in and around "hot spots".

Adalia-System (laydbird - Adalia bipunctata)

	Introduce 50-100 larvae of Adalia bipunctata /m² in aphid "hot spots".
	Corrections: Pirimicarb (Pirimor, ZZ-Aphox, Rapid, ...), Imidacloprid (Confidor, Admire)

Biological control of spider mites

(two-spotted spider mite - Tetranychus urticae)

Californicus-System (predatory mite - Amblyseius californicus)

Introduce 2-4 Amblyseius californicus/m² throughout the greenhouse as soon as spider mites are spotted. Repeat when necessary.

Phytoseiulus-System (predatory mite - Phytoseiulus persimilis)

	Introduce 4-6 Phytoseiulus/m².
	In and around "hot spots": 20 Phytoseiulus/m².

Feltiella-System (gall midge - Feltiella acarisuga)

	Introduce 250 Feltiella acarisuga/"hot spot" per week for 3-4 weeks.
	Corrections: Fenbutatin oxide (Torque), Hexythiazox (Nissorun, César, Trevi), Clofentezin (Apollo)

Biological control of whitefly

	(greenhouse whitefly - Trialeurodes vaporariorum)
	(sweet potato whitefly - Bemisia tabaci)

Encarsia-System (parasitic wasp - Encarsia formosa)

	Introduce 0,5 - 1 Encarsia formosa/m² every 2 weeks when whiteflies are spotted in the greenhouse. Repeat until a sufficient number of whiteflies are parasitized (80-90%).
	Corrections: Buprofezin (Applaud), Pyriproxifen (Admiral, Juvinal, ...)