LANDSCAPING SERVICES
While leaf miner is endemic now , arborists , landscapers and grounds managers are finding ways to combat the condition , he says .
“ The moths typically emerge just after the tree ’ s leaves have expanded . Disposing of leaf litter can help reduce or prevent outbreaks and while no licence is currently available specifically for treating horse chestnut leaf miner , spraying with a broad-spectrum systemic insecticide , such as synthetic pyrethroid ( trade names include Decis and Bandu ) designed for amenity trees , is proven to be effective ,” he explains .
“ Tightly focusing the spray using a lance targets the treatment liquids where they are most needed ,” he says . “ Ideally , apply the liquid until just before run-off occurs as that ensures maximum adhesion to leaves .”
Turning his attention to larger specimens , Dr Banks adds that Bartlett Tree Experts have developed tailored management services , using spray equipment designed to safely deliver plant protection products efficiently and effectively to the canopy .
“ Leaf miners have three generations during the summer so follow-up spraying is critical , he states . “ Two treatments usually are applied . The first , in April or May , lasts three to four weeks , then it ’ s time for the second application . However , a third spray will provide better coverage for the full season .”
Lance spraying also delivers ecological benefits , Dr Banks believes . “ We ’ re not just spraying for our own sakes . Losing leaves midseason deprives wildlife of habitat and the less spray that falls where it is not needed or where it may cause harm , such as any nearby water , the better .”
Spring is a time when clients realise their trees are not in full health , or are dead and yell for advice , he says . “ It ’ s a good time to look at trees as often we can see branch structure very well but also gain an idea of what ’ s coming into leaf , depending on the species .”
The good news about horse chestnut bleeding canker , which is caused by the pseudomonas bacteria , is that more trees may be tolerating the disease due to system induced resistance , he adds – because wholesale loss of our conker trees would deprive new generations of children of a favourite pastime .
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