[lemma=infestation | □] □
[lemma=infestation | □=□] □
[lemma=infestation | !□] □
' False silver leaf ' may have a variety of causes such as severe insect infestation , cold weather conditions , extreme drought or a form of malnutrition . Insect pests are of lesser concern and include tent caterpillars , aphids , Japanese beetles , borers and spider mites . Borer and Wuorinen have another study under way to follow up , looking at how participants rate their hunger after doing 10 small bouts of exercise in one day . Clinometers measure the height of trees ; diameter tapes measure the diameter ; and increment borers and bark gauges measure the growth of trees so that timber volumes can be computed and growth rates estimated . That 's right , we're finishing up with Infestation , the red Seventh EditionTM theme deck . Examples of insect pests that can sense a tree under stress include the pine bark beetle , bronze birch borer , two-lined chestnut borer , sap beetle ( transports oak wilt fungus ) , and some scale insects . The infestation and spread of the disease then would be monitored through the use of aircraft or spacecraft-based sensor systems , as well as input from various computational models . On apricot , nectarine , plum , and prune trees , it controls apple maggot , oriental fruit moth , peach twig borer , plum curculio , and red-banded leafroller ; on peach trees , Japanese beetles , oriental fruit moth , peach twig borer , plum curculio , and tarnished plant bug . Corn has been modified to express an insecticidal toxin from the Bacillus thuringiensis bacteria as protection against the European corn borer and is being planted widely in Illinois . Key pests that are attracted to light include the European corn borer , codling moth , cabbage looper , many cutworms and armyworms , diamondback moth , sod webworm moths , peach twig borer , several leaf roller moths , potato leafhopper , bark beetles , carpet beetles , adults of annual which grubs ( Cyclocephala ) , house fly , stable fly , and several mosquitos . During the early stages of infestation , the green , worm-like larvae of the ash sawfly feed on the interior of leaves making " pinhole " wounds . Stem boring insects can be further divided into phloem borers and wood borers . Nor is it practical for individuals faced with a pest infestation and contemplating the use of pesticide products or pest control services to be required to file freedom of information requests , and then wait months or years to obtain the information needed to make informed decisions . Michigan has been heavily impacted by the emerald ash borer and potentially could have a large supply of dead ash trees . He has sprayed his corn fields twice in the past 20 years for corn borer and his soybean fields once for spider mites . Potential insect pests are of lesser concern and include tent caterpillars , aphids , Japanese beetles , borers and scale . Their training remains arduous and maintenance necessary , but personal preparation is limited to getting their coats properly treated to repel insect infestation and receiving immunizations to prevent infectious diseases to which they might be exposed . Egg infestation and S. faberi seeding will occur immediately after maize planting . The ‘ revolution in the tools ’ , the increasing introduction from the eighties onwards , of capstan and turret lathes , milling machines , grinders , the radial arm drill , the vertical borer and so on , all capable of being operated by semi-skilled men , undermined the position of the time-served centre lathe turner and converted a lot of fitters ’ work into semi-skilled assembly . Plants left in the garden provide shelter for many insects such as Mexican bean beetle , squash bug , imported cabbageworm , diamondback moth , European corn borer , hornworms , corn earworm , bean leaf beetle , asparagus beetle , harlequin bug , cowpea curculio , and others . Currently , treatment is recommended if 30 % of the terminals are infested with either species of aphid , or at 50 % terminal infestation and less than 20 % of the terminals with predators . The telltale signs of infestation , dime-sized adult exit holes or the much smaller egg-laying sites , were often well concealed and high in the tree canopies .