Extension, USU

English

DigitalCommons@USU

Published by Utah State University Extension and Utah Plant Pest Diagnostic Laboratory June 2010ENT-7SF-06Utah Pests Sampling Form:Western Tentiform LeafminerComplete Sampling MethodOrchard Block:_________________________________________  Variety: _________________________Date: _______________________________  Number of Mines per Leaf – Second and Third GenerationsLeaf 1 Leaf 2 Leaf 3 Leaf 4 Leaf 5 Leaf 6 Leaf 7 Leaf 8 Leaf 9 Leaf 10 Tree TotalTree 1Tree 2Tree 3Tree 4Tree 5Tree 6Tree 7Tree 8Tree 9Tree 10Total number of mines for 10 treesAverage number  of mines per leaf  for 10 trees (divide above sum by 100)Percentage of Leafminer Parasitism (necessary when “total mines” is 10 or more)Number of Dead/Parasitized Leafminers out of 50 mines(Record with tick marks) Total Percentage of Parasitism(divide Total by 50)When and How Often to Sample:Second Generation(Can be done at same time as mite sampling.)  Start scouting in mid-June, and continue to early July every other week.Third GenerationSample for mines in early to mid-August if leafminers were not treated during the second generation, or if the density of mines was high.Materials:1.  16 – 20x hand lens2.  Ziploc bags in which to put leaves3.  Calculator to determine parasitism percentageInstructions:1.  Choose one or several representative orchard blocks for sampling.2.  Randomly select 10 trees scattered throughout a 2- to 5-acre block. If the orchard is larger than 5 acres, it may be necessary to sample more trees.3.  On each sampling date, collect 10 leaves from each of the 10 trees (100 leaves total).  Pick leaves that occur between the middle and base of vegetative shoots.  These same leaves can be used to monitor for mites (refer to mite sampling form).4.  Count and record the number of mines and deter-mine the average number of mines per leaf for each orchard block. (To find the average, divide the total number of mines by 100.)5.  If leaf mine counts are high (more than 2 mines per leaf), record counts from every leaf. Otherwise, record only total mine counts from all 10 leaves for each tree.6.  If the total count for the 100 leaves is 10 or more mines, then sample again to determine parasitism percent-age in the block:a.  Search the orchard for leaves with mines, and col-lect enough samples to total 50 mines.b.  Dissect each mine and record whether the larva or pupa inside is alive or dead or appears to have been parasitized.  c.  Use tick marks to record the number of dead or parasitized leafminers.d.  Determine orchard percentage of parasitism by dividing the number of parasitized leafminers by 50.Treatment Thresholds:Second GenerationEarly June—1 or more mines per leaf and parasitism of larvae less than 30%Mid-June to Early July—2 or more mines per leaf and parasitism less than 30%Third GenerationAugust—5 or more active mines per leafFor more information, see the Western Tentiform Leafminer fact sheet.Western Tentiform Leafminer Sampling InstructionsUtah State University is committed to providing an environment free from harassment and other forms of illegal discrimination based on race, color, religion, sex, national origin, age (40 and older), dis-ability, and veteran’s status. USU’s policy also prohibits discrimination on the basis of sexual orientation in employment and academic related practices and decisions.  Utah State University employees and students cannot, because of race, color, religion, sex, national origin, age, disability, or veteran’s status, refuse to hire; discharge; promote; demote; terminate; discriminate in compensation; or discriminate regarding terms, privileges, or conditions of employment, against any person otherwise qualified. Employees and students also cannot discriminate in the classroom, residence halls, or in on/off campus, USU-sponsored events and activities.  This publication is issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Dept. of Ag., Noelle E. Cockett, Vice President for Extension and Agriculture, Utah State University.Page 2UPPDL, 5305 Old Main Hill, Logan UT 84322, utahpests.usu.edu T: 435.797.2435  F: 435.797.8197Fact Sheet Series:  Insects - Tree Fruit Sampling FormsPrecautionary Statement:  Utah State University Extension and its employees are not responsible for the use, misuse, or damage caused by application or misapplication of products or information mentioned in this document.  All pesticides are labeled with ingredients, instructions, risks, and registered crops or other hosts.  The pesticide applicator is legally respon-sible for proper use.  USU makes no endorsement of the products listed herein.

Western Tentiform Leafminer Sampling Form – Apple and Cherry

https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1987&amp;context=extension_curall

Western Tentiform Leafminer Sampling Form – Apple and Cherry

Abstract

Similar works

Full text

Available Versions

DigitalCommons@USU