This is a picture of a brown stink bug and also the green stink bug.
Stink Bugs
Month: June 2014
Stalk Borer Damage in Corn
In this photo you see what is called a stalk borer. It will get into the stalk of corn and eat through it at the bottom. You can tell that you have these by having wilting whorls but the rest of the plant will be fine. If you pull out the wilted whorl and unroll it you will either find the feeding or the borer itself.
Week of June 16 – 20 Scout Summary
AGRONOMIC CROPS:
- Corn: Scouted fields ranged from v1 to v7 stage of development. One field that had slugs at threshold level, treated with bait and got very good control, new leaves did not show slug feeding damage. Most other fields had just light slug feeding damage. Other insects found in small numbers causing light damage to corn include black cutworm, corn borer, stalk borer and armyworm. Weeds are an issue in some fields.
- Soybeans: Many soybean fields just planted. Stage of development ranged from emergence to V3. Some light slug and bean leaf beetle feeding damage was noted.
- Alfalfa: Potato leafhoppers were noted at low levels. Aphid numbers have declined from the previous week. The alfafa plant bug showed up in small to medium numbers and a few stink bugs were found in sweep nets.
Week of June 16- 20 Scout Summary
VEGETABLES:
- Cole crops: Cabbage, Cauliflower and Broccoli: Most cole crops look good. Imported cabbage worm larvae were found in some fields at economic treatment threshold levels. Flea beetle damage and numbers were noted at mostly low levels.
- Onions and Garlic: Thrips are generally present but at low levels, well below threshold.
- Peas: Doing well at this time with no problems noted.
- High tunnel tomatoes: Botrytis, early blight, pith necrosis and timber rot/white mold diseases were noted by scouts along with tobacco spotted wilt virus (vectored by thrips) noted on some cherry tomatoes.
- Field tomatoes: Most tomatoes looking good at this point. Some early blight was found and a sample submitted for possible bacterial spot diagnosis.
- Sweet corn: Corn tasseling beginning in some fields. Corn borer damage was noted, still below economic treatment threshold. Corn borer moths are being caught in pheromone traps. Armyworm damage was found at light levels.
- Cucumbers: Cucumber beetles being found. Several fields over economic treatment threshold. Angular leaf spot, a bacterial disease, is appearing on some plants.
- Zucchini and Summer Squash: Cucumber beetles at threshold in some fields. Scouts noted angular leaf spot, and anthracnose diseases, also some blossom end rot.
- Winter Squash and Pumpkins: Cucumber beetles were found over economic threshold level in some fields. Some light slug feeding was also noted.
- Melons: Anthracnose and bacterial wilt have been found. Some melons had cucumber beetles over economic threshold. Some light slug feeding was found.
- Potatoes: Colorado potato beetles (CPB) are being found in moderate to heavy numbers, eggs, larvae and adult forms. Many potatoes have CPB over economic threshold and are spraying for control.
- Peppers: Most peppers looking good. Scouts did note some light feeding by flea beetles on some plants.
- Eggplant: Potato leaf hopper (PLH), CPB, and flea beetles were all found on eggplant. All three insects were found in some planting s over economic treatment level.
- Green/Snap Beans: Some anthracnose was noted on green beans. Slug feeding, bean leaf beetle feeding damage were noted at light levels in some plantings. Grasshoppers were found at small numbers. PLH were noted at above economic treatment threshold in some plantings.
Week of June 16 – 20 Scout Summary
FRUIT:
- Apples: Fruit set and fruit development is progressing. In orchards that did not keep up with a fungicide spray program or that did not get good coverage on trees, scab is showing up at a higher incidence level. Symptoms of fire blight are noted in some orchards. Scouts noted the presence of of red and 2-spotted spider mites on some apple trees. On some varieties of apples mites reached the economic treatment threshold.
- Strawberries: Berry picking is ongoing, but approaching the end of the harvest. Scouts noted the presence of leather rot on some berries. No spotted wing drosophila found in any of the traps.
- Grapes: Scouts noted symptoms of grape black rot in some locations. Grape berry moth numbers in pheromone traps stayed at relatively low numbers.
- Brambles, Blackberries and Raspberries: Some anthracnose and cane blight noted by scouts at low levels in some plantings. No brown marmorated stink bugs (BMSB) found in BMSB traps.
- Blueberries: Some early varieties are turning color, no problems noted by scouts. No spotted wing drosophila found in any of the traps.
ArmyWorm Damage
In this photo you see an armyworm. An armyworm will eat away the majority of the leaf on a corn plant, usually just leaving the middle of the leaf.
Week of June 9 – 13 Scout Summary
AGRONOMIC CROPS:
- Corn: Scouted fields ranged from emerging to V5 stage of development. Slug feeding damage ranged from 2 to just over 35%. One field had an area of slug feeding at threshold level. Black cutworm damage was found a 1-2% cut plants and cutworms at instar stage 6-7.
- Soybeans: Many soybean fields just planted. Stage of development ranged from emergence to V1. Some light slug and bean leaf beetle feeding damage was noted.
- Alfalfa: Potato leafhoppers were noted at low levels. In some fields, aphids were being found. Scouts also noted the presence of lady beetle adults and larvae.
Week of June 9 – 13 Scout Summary
VEGETABLES:
- Cole crops: Cabbage, Cauliflower and Broccoli: Most cole crops look good. Treatments for flea beetle have been effective. Scouts noted some low levels of slug and flea beetle feeding damage.
- Onions and Garlic: Thrips are generally present but at low levels, well below threshold.
- Peas: Doing well at this time with no problems noted.
- High tunnel tomatoes: Botrytis, early blight, pith necrosis and timber rot/white mold diseases were noted by scouts along with tobacco spotted wilt virus (vectored by thrips) noted on some cherry tomatoes.
- Field tomatoes: Most tomatoes looking good at this point. Some early blight was found.
- Sweet corn: In various fields and across planting dates ranged in size from one inch to 22 inches in height. Some light slug damage and light cutworm damage observed by scouts in several plantings. Corn borer damage was noted in one field at low levels and some armyworm damage also noted.
- Cucumbers: Most plantings look very good. Some cucumber beetles noted in some fields and high tunnel plantings. Scouts also noting the presence of lady beetles.
- Zucchini and Summer Squash: Cucumber beetles at threshold in some fields. Scouts noted a few instances of angular leaf spot and blossom end rot on some fruit.
- Winter Squash and Pumpkins: No problems noted.
- Melons: Ground hog damage (eating plants) was found in a couple of fields.
- Potatoes: Both flea beetles and Colorado potato beetles (CPB) were noted at threshold levels with recommendations that growers begin rescue treatments. Scouts noted eggs, larvae and adults of CPB.
- Peppers: Most peppers looking good. Scouts did note some light feeding by flea beetles on some plants.
- Eggplant: Scouts noted low levels of CPB, and flea beetles at treatment threshold levels in some fields.
- Green/Snap Beans: Most plantings looked good. A few had bean leaf beetle feeding damage at threshold level.
Week of June 9 – 13 Scout Summary
FRUIT:
- Apples: Fruit set and fruit development is progressing. In orchards that did not keep up with a fungicide spray program or that did not get good coverage on trees, scab is showing up at a higher incidence level. Scouts noted the presence of low numbers of red and 2-spotted spider mites on some apple trees.
- Strawberries: Berry picking is in full swing. Scouts noted some leaf spot and anthracnose along with light levels of spittle bugs and some light slug feeding on ripe berries in some strawberry fields. No spotted wing drosophila found in any of the traps.
- Grapes: Scouts noted symptoms of grape black rot in some locations. Early season fungicide spray for control of grape black rot and phomopsis cane blight needs to continue. Grape berry moth numbers in pheromone traps declined from the previous two weeks.
- Brambles, Blackberries and Raspberries: Some anthracnose and cane blight noted by scouts at low levels in some plantings.
- Blueberries: Some early varieties just beginning to turn color, no problems noted by scouts. No spotted wing drosophila found in any of the traps.
Black Cutworm Damage
This is the type of damage a black cutworm can do. In the photo is a cutworm that is near, or already in it’s last instar, being the 7th. The cutworm is being compared to a V2 stage corn stalk that is somewhere between 2 and 3″ tall. The cutworms like the smaller corn because it is easier for them to shew through. Once they have chewed through the stalk they will then carry it back to their hole, which is where one of the scouts dug this one from. These shouldn’t be around much longer considering the size of this guy but it’s just something to watch for.
