6 May - Watch out for fluffy white mass

Adelgids: Check for the fluffy white mass of this pest on the needles of pines, junipers and Cedrus. Control with Dursban WG, Hallmark WZT (SOLA 2008-2944) or Talstar 80 Flo (until 30th May 2011) with a wetting agent.

Beech woolly aphid and cherry aphid: Apply Calypso (SOLA 2008-2831), Chess WG or Gazelle to outdoor ornamental cherries. Excellent control can be achieved with these products even if the cherry black aphid has started to distort the foliage. Woolly aphid on green and purple beech can also be controlled using one of these insecticides. I have seen this pest on pines too.

Feeding: Use a high-nitrogen liquid feed product now on nursery stock. Choose a 2:1:1 on sprinkler systems or 2:0:1 on drip systems. Avoid liquid feeding during warm days or in direct sunlight to prevent scorch.

Sucker insect: Present now on bay, citrus and Pyrus. Control with Calypso, Decis, Gazelle SG, Hallmark WZT, Savona or Spruzit depending on whether you operate an IPM system or not. SOLAs are required for some of these products for use on edible crops and will have application and harvest interval restrictions.

Blister mites: These can be present on Pyrus in May. Check stems and foliage (using a hand lens) of Pyrus, Sorbus and Fraxinus and spray with Hallmark WZT (SOLA 2008-2944) or Envidor (SOLA 2009-3366) if seen.

Vine weevil larvae: Grubs are now pupating, making them difficult to control. Active larvae may also be found in untreated containers. If the crop is ready for sale, drench with Intercept 70WG.

Aphids: Protected crops can have applications of Aphidius colemani to control melon cotton and peach potato aphids and Aphidius ervi for the potato aphid, glasshouse potato aphid and others.

IPM-friendly products include Aphox, Chess WG (SOLA 2008-2834), Majestik, Naturalis-L, Savona and SB Plant Invigorator. Other products include Actara (SOLA 2008-2801), Calypso (SOLAs required), Decis, Gazelle or Hallmark WZT (SOLA 2008-2944). Drenches of Intercept 70WG are effective in controlling aphids on crops subject to biological controls later in the season. Rotate products with different IRAC codes to avoid pest resistance.


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