1 June - Rust and Adelgids

Rust Check campanula, fuchsia, hollyhocks, hypericum, iris, mahonia, Mentha, rose and vinca. Protect foliage using Reflect (EAMU 2016-1602). Amistar (EAMU 2009-0443), Bumper 250EC (EAMUs required) or Signum (EAMU 2012-2141) will control infections. Products in FRAC group 3 can produce unwanted growth-regulant effects, especially on sensitive crops.

Adelgids Control these woolly aphid-like pests using Decis (non-IPM, EAMU 2014-1011) or Hallmark WZT (non-IPM, EAMU 2008-2944) plus a wetting agent (where product appropriate) for better penetration. Nymphs form pineapple-shaped galls on Abies, juniper, larch, Picea, pine and Pseudotsuga. Galls are usually larger on young strong shoots.

Spider mites Extremely active on vulnerable crops. Control using Borneo (EAMU 2008-1216), Dynamec, Hallmark WZT (non-IPM, EAMU 2008-2944), Masai, Naturalis-L or SB Plant Invigorator. Some less harmful products may still cause some temporary damage to sensitive predators such as Phytoseiulus persimilis. Warm weather will require a switch to more heat-tolerant species such as Amblyseius andersoni or A. californicus.

Ash leaf sucker Control using Decis (EAMU 2014-1011), Hallmark WZT (EAMU 2008-2944), Pyrethrum 5EC or Spruzit if required. Leaf edge curling and purple discolouration on new foliage will show this month.

Capsids Bright-green insects that feed by piercing holes on buds and young leaves of Caryopteris, choisya, dahlia, forsythia, hydrangea and roses. Control with Calypso (EAMUs required), Decis (EAMU 2014-1011), Hallmark WZT (EAMU 2008-2944), Movento (EAMU 2011-1987) or Toppel 100. All these products are non-IPM.

Pine shoot moth Decis or Toppel 100 will help to disrupt egg-laying and larvae hatching on outdoor crops.

Cultural work Shade protected eucalyptus to prevent oedema — corky patches on leaves — in warm, humid conditions. Improve airflow on protected crops of Buddleja, Digitalis and Phygelius to reduce the risk of black sticky spots on leaves and stems.

Scale insects Control on Aesculus, camellia, Cercis, Laurus nobilis, Hedera, ribes and Taxus with Chess WG (EAMUs required), Decis (non-IPM, EAMU 2014-1011), Hallmark WZT (non-IPM, 2008-2944), Pyrethrum 5EC, SB Plant Invigorator or Spruzit.

Tarsonemid mites Apply Apollo 50SC (EAMU 2016-2082), Dynamec or Envidor (outdoor use only, EAMU 2016-0997). Use biological control agents such as Amblyseius cucumeris, A. andersoni and A. californicus.


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