From the nursery

Pine shoot moth Remember to apply Toppel 100 EC, Dursban WG or bifenthrin now to control grubs. Check for gumming around buds and limp leader growth. We should be vigilant for other types that can attack ornamentals (leopard, swift and tortrix moths among others). Check those plant species that you know are vulnerable, particularly under protection.

Aphids If using biological control, make sure you are using the right predator and check which aphid you are targeting. If you find that you are still not getting good control consider adding Adalia to the crop. This is an ideal product to support an Aphidius programme.

Scale insects Scale insects are still mobile. If seen on non-edibles, spray with Chess WG at the off-label rate; for edibles use SB Plant Invigorator. Any sooty mould can be cleaned up with Rovral WG.

Apple and pear sucker The suckers are often first spotted by the black sooty mould on the leaves. Control the sucker with cypermethrin, deltamethrin or Equity according to label recommendations and including harvest intervals. The sooty mould can be controlled with Rovral WG, which will be removed by the next rain or irrigation application.

Fremontodendron I suggest an application of Aliette 80WG is given to these plants in August to control aerial Phytophthora that often occurs on the stems. Also include Euphorbia in the spray programme. Increases of this disease can be linked to periods of wet, humid weather.

Spring flowering Avoid trimming plants that you want to flower this autumn such as Viburnum tinus, Ilex and Callicarpa.

Bay sucker Small nymphs suck the sap and cause leaf edge roll. For plants outside or under protection which are for immediate sale, spray with short-harvest-interval products such as SB Plant Invigorator or Stalwart (SOLA 2009-0609). Other products for either outdoor or protected stock include deltamethrin (SOLAs required), Dovetail (SOLA 2006-0643) or Toppel 100EC (SOLA 2008-0642). Check each off-label approval for harvest intervals.

Roses Adding a wetting agent to an eradicant spray application can usually control roses with stubborn powdery mildew. Using Fungaflor 100EC, food-grade potassium bicarbonate or Nimrod with a wetter normally shifts those stubborn areas. On ornamental trees you can use Corbel, but watch the warm days as it can cause foliage damage.

 


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