Looking out for summer garden pests

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Just because it’s summer, don’t expect tree and shrub pests to go on vacation. Beware of these potential pest problems.

Most people are familiar with Japanese beetles. The adults begin to cause damage in June and continue in July. They feed on the leaves of a wide variety of plants. However, the beetles do not kill healthy, established trees and shrubs, so control is needed only for aesthetic reasons.

Bagworms are serious pests of arborvitae, juniper, and other needle evergreens. They feed on the foliage and can cause permanent damage. They are typically controlled after egg hatch in June. However, plants should be checked weekly through July. Initially the bags are the size of the tip of a pencil but grow to 2 inches long.

Mimosa webworm produces webbing and brown leaves in the foliage of honeylocust and mimosa trees. If control is desired to help prevent the unsightly webbing and/or defoliation, apply a labeled insecticide in mid- to late June and again in late July to early August.

If you go on vacation to the north and east of Indiana during July or August, check to make sure you do not bring back egg masses of the gypsy moth, a serious foliage-feeding pest of many trees and shrubs. Egg masses appear as tan, velvety masses. They are laid on branches, firewood, vehicles, yard tools left outside, and many other objects.

Emerald Ash Borer Emerald ash borer

Continue to watch for symptoms of emerald ash borer damage on ash trees throughout the summer. Infested trees usually have combinations of the following six symptoms: 1/8-inch wide D-shaped exit holes in the bark, S-shaped channels under the tree’s bark, water sprouts at the base of the tree, dieback starting in the upper third of the tree, vertical splits in the bark, and increased woodpecker activity.

Emerald ash borer commonly moves to new areas on infested firewood so do not transport firewood from one area to another.

Keep recently planted maple, oak and flowering fruit trees growing vigorously to prevent damage by flatheaded tree borers. Water during dry periods and keep trees mulched.

Check mugo pine and other conifers for the 1/8-inch long white structures of pine needle scale. Treat after egg hatch during the crawler stage. This may occur in May, June and July.

Tiny white and tan structures on the stems of wintercreeper (Euonymus) are forms of Euonymus scale. Control of this insect is still possible during the crawler stage of the second generation (late July to August).

More information on these pests and other plant and pest problems is found at: http://IndyHorticulture.org.•

—Steve Mayer


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  1. Now if he'd just stay there...

  2. Daniel - what about the many US citizens who do NOT follow what the Bible teaches? The Hindus, Jews, Muslims and others who are all American citizens entitled to all rights as Americans?? This issue has NOTHING to do with "What the Bible says..." Keep all Churches separate from State! Pence's ongoing idiocy continues to make Indiana look like a backwards, homophobic state in the eyes of our nation. Can't we move on to bigger issues - like educating our kids?

  3. 1. IBJ should link to the referenced report. We are in the age of electronic media...not sharing information is lazy. Here is a link http://www.in.gov/gov/files/Blue_Ribbon_Panel_Report_July_9_2014.pdf 2. The article should provide more clarity about the make-up of this panel. The commenters are making this item out to be partisan, it does not appear the panel is partisan. Here is a list of the panel which appears to be balanced with different SME to add different perspectives http://www.in.gov/activecalendar/EventList.aspx?view=EventDetails&eventidn=138116?formation_id=189603 3. It suggests a by-pass, I do not see where this report suggests another "loop". 4. Henry, based on your kneejerk reaction, we would be better off if you moved to another state unless your post was meant as sarcasm in which case I say Well Done. 5. The article and report actually indicates need to improve rail and port infrastructure in direct contradiction to Shayla commentary. Specifically, recommendation is to consider passenger rail projects... 6. People have a voice with their elected officials. These are suggestions and do not represent "crony capitalism", etc. The report needs to be analyzed and the legislature can decide on priorities and spending. Don't like it, then vote in a new legislature but quit artificially creating issues where there are none! People need to sift through the politics and provide constructive criticism to the process rather than making uninformed comments in a public forum based on misinformation. IBJ should work harder to correct the record in these forums when blatant errors or misrepresentations are made.

  4. Joe ... Marriage is defined in the Bible ... it is mentioned in the Bible often. Marriage is not mentioned once in the US or Indiana Constitution ...

  5. Daniel - Educate me please: what does the Bible have to do with laws? If the government wasn't in the business of marriage to begin with, then it wouldn't have to "define" marriage at all. Marriage could be left as a personal, religious, or otherwise unregulated action, with no ties to taxes, legal status, etc. Then people could marry whomever they want, and all this silliness would go away. Remember to vote Libertarian in November.