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To train new branches less than three inches in length , use a wooden spring-type clothespin . At that point , caterpillars have grown to about 1 to 2 inches in length . Pots should be disinfected by soaking in a 10 % bleach solution ( 1 part bleach to 9 parts water ) for 30 minutes . Remove and dispose of infected leaves in the fall to prevent overwintering and prune out highly infected branches of rose or lilac . It is very important to clean your pruner by dipping in 10 % bleach solution or by spraying it with 70 % rubbing alcohol after cutting off diseased plant material and prior to pruning any healthy plants . Average fruit size is 1 _ to 2 inches in diameter and 2 to 2 _ inches in length . Soil pH ( degree of acidity or alkalinity ) can be determined by sending a sample of the soil to the University of Minnesota Soil Testing Facility . Common hosts include begonias , alpine current , bee balm , lilac , phlox , rose , and zinnia . Drip irrigation , which minimizes foliar wetness , is recommended for gardeners who have this problem . Controlling leaf wetness is n't enough , though ; foliar nematodes are very tolerant of dry conditions , and can remain viable for several years in decaying plant material . Second , minimize foliar wetness to reduce the spread of the nematodes between plants .