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#1
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BT or DE ?
Something is nibbling on my bok choy , and I've seen grasshoppers . Not
certain that they're to blame , but ... which will work better for grasshoppers ? Other pests that I've seen on these plants before are like a very small beetle-type bug , hopefully one of these will help with those too .. Chemicals are problematic , I'm trying to avoid any chem based insecticides because of our bees . -- Snag |
#2
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BT or DE ?
Derald wrote:
"Terry Coombs" wrote: Something is nibbling on my bok choy , and I've seen grasshoppers . Not certain that they're to blame , but ... which will work better for grasshoppers ? Other pests that I've seen on these plants before are like a very small beetle-type bug , hopefully one of these will help with those too . Chemicals are problematic , I'm trying to avoid any chem based insecticides because of our bees . I'm kind of doubtful whether your pests are grasshoppers because, of they were, you'd not have reported something "nibbling" the bok choy.... ;-) One thing grasshoppers do not do is nibble! Bt is a genus-specific pathogen that is totally ineffective on grasshoppers. DE may be minimally effective, if applied directly to the animals, and less so when broadcast. In either case, its residual effect is detrimental to the innocuous and/or "beneficial" insects. Grasshoppers are difficult to control because of the great distances adults travel. Poisoned bait has the most immediate effect and a biological agent ("nolo", a locust-specific pathogen), the longest-term (AWA cumulative) effect but under a rather narrow set of conditions. The timing of application-within a day or so of emergence-greatly affects the efficacy of either. FWIW: Grasshoppers have been my most chronic and difficult to control garden "pest". I have grasshoppers in all stages of development year 'round, except for the coldest days. Two successive annual applications of "nolo" over a large area (acres) "seem" (purely anecdotally) to have been of benefit but my perception is likely twisted by memories of the cash outlay (BMW Syndrome). Bait or so-called "trap" crops are effective when actually interplanted _in the garden_. Last season I "discovered" pokeweed to be a superior protector of eggplant and this season I have picked out some seedlings for transplantation. Perhaps this year, I will beat the birds to enough poke seeds to be able to learn to germinate them. Hmm , I've got 30 marigolds in 4" pots that need homes ... I've been trying to decide where they should go . For sure some will go in alongside the bok choy . Also want to put some around the roses , scatter the rest around the garden . I shoulda planted twice that number ... I've pretty much quit using insecticides of any kind , and have seen an upsurge of insect activity - some good , some bad . I've also seen a lot more lizards around the last couple of years ... -- Snag |
#3
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BT or DE ?
Terry Coombs wrote:
Something is nibbling on my bok choy , and I've seen grasshoppers . Not certain that they're to blame , but ... which will work better for grasshoppers ? Other pests that I've seen on these plants before are like a very small beetle-type bug , hopefully one of these will help with those too . Chemicals are problematic , I'm trying to avoid any chem based insecticides because of our bees . you may want to be sure of the critter you are after before deploying defenses. can you check the plants after dark or at other times of the day to see if you can find the insect that is doing the damage? i hand pick grasshoppers off the garden plants once in a while, but the birds get more of them. songbird |
#4
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BT or DE ?
Terry Coombs wrote:
Something is nibbling on my bok choy , and I've seen grasshoppers . Not certain that they're to blame , but ... which will work better for grasshoppers ? Other pests that I've seen on these plants before are like a very small beetle-type bug , hopefully one of these will help with those too . Chemicals are problematic , I'm trying to avoid any chem based insecticides because of our bees . In sunlight look very closely particularly under leaves, along stems and down in the centre. Run your fingers over leaf surfaces. One candidate is cabbage butterfly larvae, they can be very well camouflaged indeed, especially if small. If your closeup eyesight isn't good use reading glasses or a magnifier. If nothing then go out at night with a light after the dew has fallen or after you have watered. There is no point in doing anything until you identify the eater. For example if it is slugs or snails BT will do nothing whatsoever as it is specific to insect larvae. -- David - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Corporate propaganda is their protection against democracy |
#5
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BT or DE ?
David Hare-Scott wrote:
Terry Coombs wrote: Something is nibbling on my bok choy , and I've seen grasshoppers . Not certain that they're to blame , but ... which will work better for grasshoppers ? Other pests that I've seen on these plants before are like a very small beetle-type bug , hopefully one of these will help with those too . Chemicals are problematic , I'm trying to avoid any chem based insecticides because of our bees . In sunlight look very closely particularly under leaves, along stems and down in the centre. Run your fingers over leaf surfaces. One candidate is cabbage butterfly larvae, they can be very well camouflaged indeed, especially if small. If your closeup eyesight isn't good use reading glasses or a magnifier. If nothing then go out at night with a light after the dew has fallen or after you have watered. There is no point in doing anything until you identify the eater. For example if it is slugs or snails BT will do nothing whatsoever as it is specific to insect larvae. have you seen the small white butterflies around yet? the eggs are not too hard to see if they are being laid on the undersides of the leaves. the larvae are very sneaky on the cabbage plants, it seems like they hide down along the stems when the day gets sunny. might have better luck finding them early in the morning. their massive piles of droppings can give them away. if you have wasps about, don't kill them, they will help control cabbage butterfly larvae. songbird |
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